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Allegheny County
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Official starting points / the open-data field guide
Look closer: county data.
Counties may share parcel maps, services, budgets, and more. These are 25 selected starting points.
25 of 25 starting points
VAOpen data catalog
Arlington County
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TXOpen data catalog
Bexar County
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COGIS and maps
Boulder County
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ILOpen data catalog
Cook County
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VAGIS and maps
Fairfax County
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TXOpen data catalog
Harris County
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MNGIS and maps
Hennepin County
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WAOpen data catalog
King County
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ILGIS and maps
Lake County
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CAOpen data catalog
Los Angeles County
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AZGIS and maps
Maricopa County
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INOpen data catalog
Marion County / Indianapolis
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NCGIS and maps
Mecklenburg County
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FLOpen data catalog
Miami-Dade County
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WIOpen data catalog
Milwaukee County
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MDOpen data catalog
Montgomery County
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ORGIS and maps
Multnomah County
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MDOpen data catalog
Prince George's County
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MNOpen data catalog
Ramsey County
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CAOpen data catalog
San Mateo County
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KSGIS and maps
Sedgwick County
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NYOpen data catalog
Suffolk County
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TXOpen data catalog
Travis County
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NCOpen data catalog
Wake County
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Directory checked October 17, 2026. Selected county examples; coverage is not complete. Links may change. Inclusion is not endorsement. Check licenses, update dates, and download rules on each portal.
Before you download: stop and check.
- 01Read the date. Is the dataset current enough for your question?
- 02Read the description. What is counted, and what is missing?
- 03Read the rules. Public access does not always mean unlimited reuse.
- 04Save the source. Keep the link, license, and download date with your work.
Source: Data.gov official government portal directory ↗
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