2020 ZCTA to County Relationship File (U.S. Census Bureau)
U.S. Census Bureau
Each 2020 Census ZIP Code Tabulation Area and the counties it shares land with, with each county's share of its land.
Not included: ZCTAs approximate postal ZIP codes; PO-box-only ZIPs have none.
U.S. Census Bureau · 2020 ZCTA to County Relationship File (U.S. Census Bureau) · data for 2020 · as of Dec 9, 2021 · retrieved Oct 31, 2026 · CC-BY-4.0 May be out of date. The next release was due by Dec 9, 2022. Last checked for an update: Oct 31, 2026.
Generated Oct 31, 2026
Next release expected around Dec 9, 2022, judged from the usual schedule.
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The publisher’s terms, as captured on Oct 31, 2026:
Proper citation ensures that Census Bureau statistical products and research can be discovered, reused, replicated for verification, and credited for recognition to measure usage and impact. Data users who create their own estimates using data from disseminated tables and other data should cite the Census Bureau as the source of the original data only. Conclusions drawn from any analysis of these data are the sole responsibility of the performing party.
Credit
Source: U.S. Census Bureau, 2020 ZCTA to County Relationship File.
Critical infrastructure screen
Screened automatically on Oct 31, 2026 under 18 CFR 388.113: not grid infrastructure, and none of its 8 columns holds a location or network detail.
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- zcta_counties: 46,953 rows, gzip CSV, 677,141 bytes
SHA-256 fb57e7a1a52e0a0be10de7a7b8a06dd516ddc972af9ca7fc0adcdbe7459a968aLicense: CC-BY-4.0. Credits: Source: U.S. Census Bureau, 2020 ZCTA to County Relationship File.
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Stable file addresses
Permanent: /data/census-zcta-county/2026-10/<file> · Latest: /data/census-zcta-county/latest/<file>
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How to cite this version
U.S. Census Bureau. 2020 ZCTA to County Relationship File (U.S. Census Bureau), data for 2020, released Dec 9, 2021. Redistributed by gridprims.com, version 2026-10, manifest SHA-256 5c21f975594ddcaad213dc8a8d609d9615d65c9105e80fd7980e17721218c886. https://gridprims.com/data/census-zcta-county/2026-10/
Publisher’s original file
Versions
| Version | Data period | Retrieved | Manifest and SHA-256 |
|---|---|---|---|
| 2026-10 (current) | 2020 | Oct 31, 2026 | manifest.json 5c21f975594ddcaad213dc8a8d609d9615d65c9105e80fd7980e17721218c886 |
Columns: ZCTAs and the counties they share land with, with each county's share
| Column | Type | Unit |
|---|---|---|
| zcta | str | |
| county_fips | str | |
| county_name | str | |
| state | str | |
| state_fips | str | |
| land_part_m2 | f64 | square meters |
| zcta_land_m2 | f64 | square meters |
| share_of_zcta_land | f64 | fraction |