Files
republic-os/data/jurisdictions/us/states/il/counties/champaign/index.md
T
Fabio 1beeaab2db Graph: national county↔district↔legislator authority layer
The first edges in the repo. Every US county now links to the districts it
sits in, weighted by area overlap, and every legislator links to the district
they represent — county → district → representative, traversable.

Data (PostGIS, no Atlas dependency — computed directly from geometry):
- data/county_district_edges.jsonl — 16,328 weighted edges. area_weight =
  ST_Area(ST_Intersection(county, district))/ST_Area(county) over ST_MakeValid
  Census TIGER 2024 geometries, overlaps <0.5% dropped. Uses area-intersection,
  NOT centroid-in-polygon, so urban districts that carve through counties
  (e.g. GA CD-5 / Atlanta across Clayton+DeKalb+Fulton) are captured, not
  silently dropped. Per-county weights sum to ~1.0 per district type.

build.py:
- ~6,896 new district nodes: 435 CD (ACS demographics where available; sparse
  for the 8 states missing from acs_cd) + 4,927 state-house + 1,897 state-senate
  (geometry-only). GEOID/number-keyed, stable.
- county index.md gains a `districts:` block (frontmatter) + a ## Districts
  section (body links, so link-integrity checks them).
- legislators + US House members gain `represents:` pointing at their district
  node; edge stored once on the person, inverse left to the view.
- schemas/jurisdiction: classification enum + chamber/districts fields.

Honest gaps (logged, not hidden): ID + NH have no state-house geometry, so
their house districts get nodes (represents resolves) but no county edges;
CD nodes for acs_cd-missing states are demographically sparse.

Deterministic (byte-identical rebuild); validate.py passes 26,617 records,
link-integrity clean (every district/represents link resolves).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-04 22:28:08 -04:00

2.8 KiB
Raw Blame History

type, title, classification, fips, state, demographics, districts, sources, confidence, tags, timestamp
type title classification fips state demographics districts sources confidence tags timestamp
Jurisdiction Champaign County, IL county 17019 IL
population population_under_18 population_18_64 population_65_plus median_household_income poverty_rate homeownership_rate unemployment_rate median_home_value gini_index vacancy_rate race_white race_black race_asian race_native hispanic bachelors_plus
208741 39863 139894 28984 63683 19.07 54.02 4.3 211500 0.5147 10.14 134024 28079 23898 381 17249 86606
to rel area_weight
us/states/il/districts/15 in-district 0.6216
to rel area_weight
us/states/il/districts/13 in-district 0.1924
to rel area_weight
us/states/il/districts/02 in-district 0.1859
to rel area_weight
us/states/il/districts/senate/51 in-district 0.684
to rel area_weight
us/states/il/districts/senate/52 in-district 0.3159
to rel area_weight
us/states/il/districts/house/101 in-district 0.586
to rel area_weight
us/states/il/districts/house/104 in-district 0.2901
to rel area_weight
us/states/il/districts/house/102 in-district 0.0981
to rel area_weight
us/states/il/districts/house/103 in-district 0.0258
field source
demographics Census ACS 2023
field source
districts PostGIS area-intersection over Census TIGER 2024 boundaries
official
jurisdiction
county
il
2026-07-03

Champaign County, IL

County jurisdiction.

Demographics (ACS 2023)

Measure Value
Population 208741
Under 18 39863
1864 139894
65+ 28984
Median household income 63683
Poverty rate 19.07
Homeownership rate 54.02
Unemployment rate 4.3
Median home value 211500
Gini index 0.5147
Vacancy rate 10.14
White 134024
Black 28079
Asian 23898
Native 381
Hispanic/Latino 17249
Bachelor's or higher 86606

Districts

Source

  • demographics: Census ACS 2023
  • districts: PostGIS area-intersection over Census TIGER 2024 boundaries