mosaic_shapefiles_extra

Mosaic — extra state shapefiles

Ready-to-use precinct shapefiles for Mosaic, with population, race/age demographics, and recent election results pre-joined.

Each <State>_DRA_Mosaic.zip contains a single TIGER/Line VTD shapefile with 14 attributes:

Column	Type	Meaning
GEOID	string	11-char VTD GEOID20 (state FIPS + county FIPS + VTD)
CTY	string	3-char county FIPS
POP_TOTAL	int	2020 total population
VAP_TOTAL	int	2020 voting-age population
VAP_WHITE	int	2020 VAP, White alone, not Hispanic
VAP_BLACK	int	2020 VAP, Black any-part (incl. Hispanic)
VAP_LATINO	int	2020 VAP, all Hispanic regardless of race
VAP_ASIAN	int	2020 VAP, Asian any-part (incl. Hispanic)
TRUMP_16 / CLINTON_16	int	2016 presidential R / D votes
TRUMP_20 / BIDEN_20	int	2020 presidential R / D votes
TRUMP_24 / HARRIS_24	int	2024 presidential R / D votes

Full schema notes and definitional choices: see DATA_LICENSE.md.

Per-state notes

• Estimated 2024 results (Arkansas, Connecticut, Maine, Michigan, New Jersey, Oklahoma, Oregon, Pennsylvania) — these files swap TRUMP_24 / HARRIS_24 for DT_EST_24 / KH_EST_24 / EST_24_FLG. The estimates come from applying each county’s reported 2020 → 2024 swing uniformly across its precincts, so county and state sums match true 2024 totals exactly. Per-precinct values are modeled — treat with caution.
• Island-precinct deletions (California, New York, Rhode Island) — offshore precincts that are disconnected from the rest of the state’s polygon graph have been removed, because Mosaic’s ReCom requires a connected precinct adjacency graph (this is also why Hawaii is not included). The affected populations are small.
• Florida — the shapefile is accurate for use in Mosaic, but it will not round-trip cleanly back into Dave’s Redistricting App due to precinct changes in a few counties. A fix is in progress.

License & use restrictions

These shapefiles are joins of two upstream sources:

1. TIGER/Line 2020 VTD shapefiles — U.S. Census Bureau (public domain).
2. Precinct-level demographic and election data — Dave’s Redistricting App (DRA).

Because they incorporate DRA-packaged data, the joined shapefiles inherit DRA’s license:

• Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/
• You may not sell this data under any circumstances (DRA’s explicit no-sale clause).
• Any redistribution must be under a compatible ShareAlike license and must attribute DRA and the upstream election-data providers (VEST, RDH, Census Bureau).

Mosaic itself is MIT-licensed; this data is not. Use accordingly.

See DATA_LICENSE.md for the full attribution table, upstream provider list, and schema choices baked into the join.

This site is open source. Improve this page.