US Census boundaries, as GeoParquet

TIGER/Line 2026, starting with the districts of the November elections

The Census Bureau publishes its TIGER/Line boundaries as national GeoPackages, several hundred megabytes each, to download before you can ask anything. Here they are as GeoParquet you query from a URL, one file per layer, with map tiles beside them. The first release is the legislative areas: every congressional district of the 120th Congress and every state legislative district.

Columns and codes are the Census Bureau's, unchanged, so they join with every other Census table. Public domain, like the source.

The districts on the ballot

Pick a chamber, then click a district. Colours only tell neighbours apart. Compare with 2024 shows what was redrawn since the last election: changed districts shaded by how much of the 2024 district they kept, the 2024 lines dashed on top. The map draws the PMTiles published beside the GeoParquet: nothing here runs on a server.

Districts per state

Click a state to zoom the map to it. On the U.S. House view, an outlined state votes on a different congressional map than in 2024. Nebraska elects a single, unicameral legislature, so it has no State House districts; the District of Columbia and Puerto Rico appear where the Census Bureau maps them.

Get the data

https://parquetry.geomermaids.com/census/tiger/2026/legislative/cd120.parquet   Congressional districts
https://parquetry.geomermaids.com/census/tiger/2026/legislative/sldu.parquet    State legislative, upper
https://parquetry.geomermaids.com/census/tiger/2026/legislative/sldl.parquet    State legislative, lower
s3://parquetry/census/tiger/2026/legislative/*.parquet   (endpoint s3.geomermaids.com, anonymous)

Each file carries TIGER's columns (STATEFP, GEOID, NAMELSAD, ALAND, AWATER and the rest), the geometry in NAD83 (EPSG:4269, geographic: longitude and latitude) and a bbox column declared as the GeoParquet covering. Rows are sorted on a Hilbert curve, so a point lookup reads one small row group, not the whole country.

The congressional district at a point

INSTALL httpfs; LOAD httpfs; INSTALL spatial; LOAD spatial;
SELECT GEOID, NAMELSAD
FROM read_parquet('https://parquetry.geomermaids.com/census/tiger/2026/legislative/cd120.parquet')
WHERE bbox.xmin <= -97.74 AND bbox.xmax >= -97.74
  AND bbox.ymin <= 30.27 AND bbox.ymax >= 30.27
  AND ST_Contains(geometry, ST_Point(-97.74, 30.27));

House seats per state

SELECT STATEFP, count(*) AS seats
FROM read_parquet('https://parquetry.geomermaids.com/census/tiger/2026/legislative/cd120.parquet')
WHERE CD120FP NOT IN ('98', 'ZZ')   -- delegates, undefined areas
GROUP BY 1 ORDER BY 2 DESC;

• Browse the files: parquetry.geomermaids.com/census/
• Portolan catalog (STAC, column docs, styles, agent guide): census/catalog/
• Map tiles: cd120.pmtiles, sldu.pmtiles, sldl.pmtiles beside each file, zoom 0 to 12, with a color_index that keeps neighbours apart.
• Credits and what was changed: ATTRIBUTION.txt

More of TIGER/Line

The Census Bureau publishes twelve national GeoPackages for 2026, from rails to census blocks. The legislative areas are the first; the others follow under the same layout, census/tiger/2026/<product>/<layer>.parquet, in the same catalog.

Licence

TIGER/Line is a work of the US federal government, not subject to copyright in the United States (17 U.S.C. 105): no restriction on use or redistribution. Credit "U.S. Census Bureau, TIGER/Line 2026". The Census Bureau makes no warranty on the data and its boundaries are for statistical purposes, not legal land descriptions.