Download the AHCB data
# Download Files
The downloads are available as the whole United States or as individual states. The data used in the _Atlas_ is readily available to download to be consulted, reviewed, and reused for any lawful purpose, commercial or non-commercial, without licensing or permission fees to the library. Please note that some files may contain the original, out-of-date copyright license; these can be ignored.
## <a id="us-dl" >Download U.S. Files </a>
### US Historical States & Territories (1783-2000)
| Files | GIS with AK/HI | KMZ without AK/HI | KMZ with AK/HI |
| -------------------------------- | ----------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------- |
| Full file not generalized | [100 MB](https://publications.newberry.org/ahcb/downloads/gis/US_AtlasHCB_StateTerr.zip) | N/A | N/A |
| Generalized .0001 deg. tolerance | [53 MB](https://publications.newberry.org/ahcb/downloads/gis/US_AtlasHCB_StateTerr_Gen0001.zip) | N/A | N/A |
| Generalized .001 deg. tolerance | [14 MB](https://publications.newberry.org/ahcb/downloads/gis/US_AtlasHCB_StateTerr_Gen001.zip) | [7 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_ExAKHI_Gen001_KMZ.zip) | [10 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_Gen001_KMZ.zip) |
| Generalized .01 deg. tolerance | [2 MB](https://publications.newberry.org/ahcb/downloads/gis/US_AtlasHCB_StateTerr_Gen01.zip) | [1 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_ExAKHI_Gen01_KMZ.zip) | [2 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_Gen01_KMZ.zip) |
| Generalized .05 deg. tolerance | [0.6 MB](https://publications.newberry.org/ahcb/downloads/gis/US_AtlasHCB_StateTerr_Gen05.zip) | [0.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_ExAKHI_Gen05_KMZ.zip) | [1 MB](https://publications.newberry.org/ahcb/downloads/kmz/US_HistStateTerr_Gen05_KMZ.zip) |
### Notes on generalizations
#### GIS Files
The Full files contain all the detail incorporated in the original state boundary files. The generalized versions of the US historical boundary files contain the counties and state/territories but the detail of the boundary lines has been reduced using algorithms incorporated in ESRI software.
#### KMZ Files
KMZ files for the US are provided both with and without Alaska & Hawaii. The following chart shows the approximate scale at which the generalization becomes noticeable on map polygons:
| File | Scale |
| -------------------------------- | ------------ |
| Generalized .0001 deg. tolerance | 1:25,000 |
| Generalized .001 deg. tolerance | 1:250,000 |
| Generalized .01 deg. tolerance | 1:2,500,000 |
| Generalized .05 deg. tolerance | 1:12,500,000 |
## Download State Files
| State Name | GIS Files | KMZ Files | PDF Files |
| -------------------- | ------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- |
| Alabama | [8.2 MB](https://publications.newberry.org/ahcb/downloads/gis/AL_AtlasHCB.zip) | [4.8 MB](https://publications.newberry.org/ahcb/downloads/kmz/AL_HistCountiesKMZ.zip) | [35.1 MB](https://publications.newberry.org/ahcb/downloads/pdf/AL_HistCountiesPDF.zip) |
| Alaska | [42.9 MB](https://publications.newberry.org/ahcb/downloads/gis/AK_AtlasHCB.zip) | [27.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/AK_HistCountiesKMZ.zip) | [16.8 MB](https://publications.newberry.org/ahcb/downloads/pdf/AK_HistCountiesPDF.zip) |
| Arizona | [2.2 MB](https://publications.newberry.org/ahcb/downloads/gis/AZ_AtlasHCB.zip) | [1.4 MB](https://publications.newberry.org/ahcb/downloads/kmz/AZ_HistCountiesKMZ.zip) | [3.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/AZ_HistCountiesPDF.zip) |
| Arkansas | [10.0 MB](https://publications.newberry.org/ahcb/downloads/gis/AR_AtlasHCB.zip) | [6.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/AR_HistCountiesKMZ.zip) | [37.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/AR_HistCountiesPDF.zip) |
| California | [10.4 MB](https://publications.newberry.org/ahcb/downloads/gis/CA_AtlasHCB.zip) | [6.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/CA_HistCountiesKMZ.zip) | [17.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/CA_HistCountiesPDF.zip) |
| Colorado | [9.4 MB](https://publications.newberry.org/ahcb/downloads/gis/CO_AtlasHCB.zip) | [6.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/CO_HistCountiesKMZ.zip) | [27.5 MB](https://publications.newberry.org/ahcb/downloads/pdf/CO_HistCountiesPDF.zip) |
| Connecticut | [2.1 MB](https://publications.newberry.org/ahcb/downloads/gis/CT_AtlasHCB.zip) | [1.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/CT_HistCountiesKMZ.zip) | [7.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/CT_HistCountiesPDF.zip) |
| Dakota Territory | [10.0 MB](https://publications.newberry.org/ahcb/downloads/gis/DT_AtlasHCB.zip) | [6.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/DT_HistCountiesKMZ.zip) | [22.4 MB](https://publications.newberry.org/ahcb/downloads/pdf/DT_HistCountiesPDF.zip) |
| Delaware | [0.8 MB](https://publications.newberry.org/ahcb/downloads/gis/DE_AtlasHCB.zip) | [0.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/DE_HistCountiesKMZ.zip) | [2.1 MB](https://publications.newberry.org/ahcb/downloads/pdf/DE_HistCountiesPDF.zip) |
| District of Columbia | [0.1 MB](https://publications.newberry.org/ahcb/downloads/gis/DC_AtlasHCB.zip) | [0.02 MB](https://publications.newberry.org/ahcb/downloads/kmz/DC_HistCountiesKMZ.zip) | [0.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/DC_HistCountiesPDF.zip) |
| Florida | [26.8 MB](https://publications.newberry.org/ahcb/downloads/gis/FL_AtlasHCB.zip) | [16.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/FL_HistCountiesKMZ.zip) | [28.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/FL_HistCountiesPDF.zip) |
| Georgia | [20.8 MB](https://publications.newberry.org/ahcb/downloads/gis/GA_AtlasHCB.zip) | [11.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/GA_HistCountiesKMZ.zip) | [98.1 MB](https://publications.newberry.org/ahcb/downloads/pdf/GA_HistCountiesPDF.zip) |
| Hawaii | [0.7 MB](https://publications.newberry.org/ahcb/downloads/gis/HI_AtlasHCB.zip) | [0.4 MB](https://publications.newberry.org/ahcb/downloads/kmz/HI_HistCountiesKMZ.zip) | [0.3 MB](https://publications.newberry.org/ahcb/downloads/pdf/HI_HistCountiesPDF.zip) |
| Idaho | [12.2 MB](https://publications.newberry.org/ahcb/downloads/gis/ID_AtlasHCB.zip) | [7.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/ID_HistCountiesKMZ.zip) | [12.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/ID_HistCountiesPDF.zip) |
| Illinois | [13.5 MB](https://publications.newberry.org/ahcb/downloads/gis/IL_AtlasHCB.zip) | [8.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/IL_HistCountiesKMZ.zip) | [18.4 MB](https://publications.newberry.org/ahcb/downloads/pdf/IL_HistCountiesPDF.zip) |
| Indiana | [10.7 MB](https://publications.newberry.org/ahcb/downloads/gis/IN_AtlasHCB.zip) | [6.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/IN_HistCountiesKMZ.zip) | [21.5 MB](https://publications.newberry.org/ahcb/downloads/pdf/IN_HistCountiesPDF.zip) |
| Iowa | [3.1 MB](https://publications.newberry.org/ahcb/downloads/gis/IA_AtlasHCB.zip) | [1.9 MB](https://publications.newberry.org/ahcb/downloads/kmz/IA_HistCountiesKMZ.zip) | [9.6 MB](https://publications.newberry.org/ahcb/downloads/pdf/IA_HistCountiesPDF.zip) |
| Kansas | [2.1 MB](https://publications.newberry.org/ahcb/downloads/gis/KS_AtlasHCB.zip) | [1.2 MB](https://publications.newberry.org/ahcb/downloads/kmz/KS_HistCountiesKMZ.zip) | [13.6 MB](https://publications.newberry.org/ahcb/downloads/pdf/KS_HistCountiesPDF.zip) |
| Kentucky | [15.1 MB](https://publications.newberry.org/ahcb/downloads/gis/KY_AtlasHCB.zip) | [9.4 MB](https://publications.newberry.org/ahcb/downloads/kmz/KY_HistCountiesKMZ.zip) | [43.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/KY_HistCountiesPDF.zip) |
| Louisiana | [10.7 MB](https://publications.newberry.org/ahcb/downloads/gis/LA_AtlasHCB.zip) | [6.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/LA_HistCountiesKMZ.zip) | [27.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/LA_HistCountiesPDF.zip) |
| Maine | [51.0 MB](https://publications.newberry.org/ahcb/downloads/gis/ME_AtlasHCB.zip) | [30.2 MB](https://publications.newberry.org/ahcb/downloads/kmz/ME_HistCountiesKMZ.zip) | [17.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/ME_HistCountiesPDF.zip) |
| Maryland | [7.2 MB](https://publications.newberry.org/ahcb/downloads/gis/MD_AtlasHCB.zip) | [4.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/MD_HistCountiesKMZ.zip) | [10.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/MD_HistCountiesPDF.zip) |
| Massachusetts | [28.8 MB](https://publications.newberry.org/ahcb/downloads/gis/MA_AtlasHCB.zip) | [17.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/MA_HistCountiesKMZ.zip) | [14.8 MB](https://publications.newberry.org/ahcb/downloads/pdf/MA_HistCountiesPDF.zip) |
| Michigan | [31.4 MB](https://publications.newberry.org/ahcb/downloads/gis/MI_AtlasHCB.zip) | [19.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/MI_HistCountiesKMZ.zip) | [18.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/MI_HistCountiesPDF.zip) |
| Minnesota | [24.2 MB](https://publications.newberry.org/ahcb/downloads/gis/MN_AtlasHCB.zip) | [15.0 MB](https://publications.newberry.org/ahcb/downloads/kmz/MN_HistCountiesKMZ.zip) | [20.1 MB](https://publications.newberry.org/ahcb/downloads/pdf/MN_HistCountiesPDF.zip) |
| Mississippi | [7.6 MB](https://publications.newberry.org/ahcb/downloads/gis/MS_AtlasHCB.zip) | [4.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/MS_HistCountiesKMZ.zip) | [24.8 MB](https://publications.newberry.org/ahcb/downloads/pdf/MS_HistCountiesPDF.zip) |
| Missouri | [13.1 MB](https://publications.newberry.org/ahcb/downloads/gis/MO_AtlasHCB.zip) | [7.9 MB](https://publications.newberry.org/ahcb/downloads/kmz/MO_HistCountiesKMZ.zip) | [34.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/MO_HistCountiesPDF.zip) |
| Montana | [13.9 MB](https://publications.newberry.org/ahcb/downloads/gis/MT_AtlasHCB.zip) | [8.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/MT_HistCountiesKMZ.zip) | [16.6 MB](https://publications.newberry.org/ahcb/downloads/pdf/MT_HistCountiesPDF.zip) |
| Nebraska | [4.3 MB](https://publications.newberry.org/ahcb/downloads/gis/NE_AtlasHCB.zip) | [2.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/NE_HistCountiesKMZ.zip) | [12.3 MB](https://publications.newberry.org/ahcb/downloads/pdf/NE_HistCountiesPDF.zip) |
| Nevada | [1.6 MB](https://publications.newberry.org/ahcb/downloads/gis/NV_AtlasHCB.zip) | [0.9 MB](https://publications.newberry.org/ahcb/downloads/kmz/NV_HistCountiesKMZ.zip) | [4.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/NV_HistCountiesPDF.zip) |
| New Hampshire | [1.4 MB](https://publications.newberry.org/ahcb/downloads/gis/NH_AtlasHCB.zip) | [0.9 MB](https://publications.newberry.org/ahcb/downloads/kmz/NH_HistCountiesKMZ.zip) | [2.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/NH_HistCountiesPDF.zip) |
| New Jersey | [4.1 MB](https://publications.newberry.org/ahcb/downloads/gis/NJ_AtlasHCB.zip) | [2.4 MB](https://publications.newberry.org/ahcb/downloads/kmz/NJ_HistCountiesKMZ.zip) | [8.4 MB](https://publications.newberry.org/ahcb/downloads/pdf/NJ_HistCountiesPDF.zip) |
| New Mexico | [1.9 MB](https://publications.newberry.org/ahcb/downloads/gis/NM_AtlasHCB.zip) | [1.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/NM_HistCountiesKMZ.zip) | [6.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/NM_HistCountiesPDF.zip) |
| New York | [10.0 MB](https://publications.newberry.org/ahcb/downloads/gis/NY_AtlasHCB.zip) | [6.0 MB](https://publications.newberry.org/ahcb/downloads/kmz/NY_HistCountiesKMZ.zip) | [19.4 MB](https://publications.newberry.org/ahcb/downloads/pdf/NY_HistCountiesPDF.zip) |
| North Carolina | [16.7 MB](https://publications.newberry.org/ahcb/downloads/gis/NC_AtlasHCB.zip) | [10.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/NC_HistCountiesKMZ.zip) | [42.1 MB](https://publications.newberry.org/ahcb/downloads/pdf/NC_HistCountiesPDF.zip) |
| North Dakota | [1.0 MB](https://publications.newberry.org/ahcb/downloads/gis/ND_AtlasHCB.zip) | [0.5 MB](https://publications.newberry.org/ahcb/downloads/kmz/ND_HistCountiesKMZ.zip) | [4.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/ND_HistCountiesPDF.zip) |
| Ohio | [9.1 MB](https://publications.newberry.org/ahcb/downloads/gis/OH_AtlasHCB.zip) | [5.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/OH_HistCountiesKMZ.zip) | [19.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/OH_HistCountiesPDF.zip) |
| Oklahoma | [5.3 MB](https://publications.newberry.org/ahcb/downloads/gis/OK_AtlasHCB.zip) | [3.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/OK_HistCountiesKMZ.zip) | [7.8 MB](https://publications.newberry.org/ahcb/downloads/pdf/OK_HistCountiesPDF.zip) |
| Oregon | [16.9 MB](https://publications.newberry.org/ahcb/downloads/gis/OR_AtlasHCB.zip) | [10.3 MB](https://publications.newberry.org/ahcb/downloads/kmz/OR_HistCountiesKMZ.zip) | [14.3 MB](https://publications.newberry.org/ahcb/downloads/pdf/OR_HistCountiesPDF.zip) |
| Pennsylvania | [4.2 MB](https://publications.newberry.org/ahcb/downloads/gis/PA_AtlasHCB.zip) | [2.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/PA_HistCountiesKMZ.zip) | [17.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/PA_HistCountiesPDF.zip) |
| Rhode Island | [2.8 MB](https://publications.newberry.org/ahcb/downloads/gis/RI_AtlasHCB.zip) | [1.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/RI_HistCountiesKMZ.zip) | [2.3 MB](https://publications.newberry.org/ahcb/downloads/pdf/RI_HistCountiesPDF.zip) |
| South Carolina | [9.2 MB](https://publications.newberry.org/ahcb/downloads/gis/SC_AtlasHCB.zip) | [5.8 MB](https://publications.newberry.org/ahcb/downloads/kmz/SC_HistCountiesKMZ.zip) | [24.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/SC_HistCountiesPDF.zip) |
| South Dakota | [1.0 MB](https://publications.newberry.org/ahcb/downloads/gis/SD_AtlasHCB.zip) | [0.6 MB](https://publications.newberry.org/ahcb/downloads/kmz/SD_HistCountiesKMZ.zip) | [5.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/SD_HistCountiesPDF.zip) |
| Tennessee | [11.3 MB](https://publications.newberry.org/ahcb/downloads/gis/TN_AtlasHCB.zip) | [6.2 MB](https://publications.newberry.org/ahcb/downloads/kmz/TN_HistCountiesKMZ.zip) | [64.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/TN_HistCountiesPDF.zip) |
| Texas | [44.3 MB](https://publications.newberry.org/ahcb/downloads/gis/TX_AtlasHCB.zip) | [27.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/TX_HistCountiesKMZ.zip) | [69.2 MB](https://publications.newberry.org/ahcb/downloads/pdf/TX_HistCountiesPDF.zip) |
| Utah | [5.6 MB](https://publications.newberry.org/ahcb/downloads/gis/UT_AtlasHCB.zip) | [3.4 MB](https://publications.newberry.org/ahcb/downloads/kmz/UT_HistCountiesKMZ.zip) | [7.9 MB](https://publications.newberry.org/ahcb/downloads/pdf/UT_HistCountiesPDF.zip) |
| Vermont | [1.8 MB](https://publications.newberry.org/ahcb/downloads/gis/VT_AtlasHCB.zip) | [1.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/VT_HistCountiesKMZ.zip) | [5.5 MB](https://publications.newberry.org/ahcb/downloads/pdf/VT_HistCountiesPDF.zip) |
| Virginia | [19.3 MB](https://publications.newberry.org/ahcb/downloads/gis/VA_AtlasHCB.zip) | [12.0 MB](https://publications.newberry.org/ahcb/downloads/kmz/VA_HistCountiesKMZ.zip) | [72.0 MB](https://publications.newberry.org/ahcb/downloads/pdf/VA_HistCountiesPDF.zip) |
| Washington | [22.8 MB](https://publications.newberry.org/ahcb/downloads/gis/WA_AtlasHCB.zip) | [13.9 MB](https://publications.newberry.org/ahcb/downloads/kmz/WA_HistCountiesKMZ.zip) | [18.4 MB](https://publications.newberry.org/ahcb/downloads/pdf/WA_HistCountiesPDF.zip) |
| West Virginia | [1.8 MB](https://publications.newberry.org/ahcb/downloads/gis/WV_AtlasHCB.zip) | [1.1 MB](https://publications.newberry.org/ahcb/downloads/kmz/WV_HistCountiesKMZ.zip) | [43.7 MB](https://publications.newberry.org/ahcb/downloads/pdf/WV_HistCountiesPDF.zip) |
| Wisconsin | [24.0 MB](https://publications.newberry.org/ahcb/downloads/gis/WI_AtlasHCB.zip) | [14.8 MB](https://publications.newberry.org/ahcb/downloads/kmz/WI_HistCountiesKMZ.zip) | [20.5 MB](https://publications.newberry.org/ahcb/downloads/pdf/WI_HistCountiesPDF.zip) |
| Wyoming | [4.4 MB](https://publications.newberry.org/ahcb/downloads/gis/WY_AtlasHCB.zip) | [2.7 MB](https://publications.newberry.org/ahcb/downloads/kmz/WY_HistCountiesKMZ.zip) | [4.5 MB](https://publications.newberry.org/ahcb/downloads/pdf/WY_HistCountiesPDF.zip) |
### Notes on State Files
#### GIS Files
Download a zipped folder containing the full dataset for the selected state. Each zipped folder contains the following files:
1. Historical Counties Shapefile (polygons) for the state's counties and county equivalents.
2. Small Changes shapefile (point feature) for all changes too small to map [if available].
3. Comprehensive Database (tab-delimited text file) for all historical data.
4. Copies of all the historical chronologies, supplemental texts, and metadata forms.
5. Copy of the free access Attribution-NonCommercial-ShareAlike Creative Commons License.
#### KMZ Files
Download a zipped folder of Atlas data formatted to be used with Google Earth and Google Maps.
#### PDF Files
Download a zipped folder containing Atlas data for each county in a state formatted in a printer and reader friendly format.