Files
republic-os/data/jurisdictions/us/states/mt/counties/fergus/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

2.2 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 Fergus County, MT county 30027 MT
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
11687 2456 6300 2931 63706 15.13 63.36 4.21 236100 0.4135 11.79 10868 66 76 263 278 2518
to rel area_weight
us/states/mt/districts/02 in-district 1.0
to rel area_weight
us/states/mt/districts/senate/19 in-district 0.8077
to rel area_weight
us/states/mt/districts/senate/39 in-district 0.1922
to rel area_weight
us/states/mt/districts/house/37 in-district 0.8076
to rel area_weight
us/states/mt/districts/house/78 in-district 0.1922
field source
demographics Census ACS 2023
field source
districts PostGIS area-intersection over Census TIGER 2024 boundaries
official
jurisdiction
county
mt
2026-07-03

Fergus County, MT

County jurisdiction.

Demographics (ACS 2023)

Measure Value
Population 11687
Under 18 2456
1864 6300
65+ 2931
Median household income 63706
Poverty rate 15.13
Homeownership rate 63.36
Unemployment rate 4.21
Median home value 236100
Gini index 0.4135
Vacancy rate 11.79
White 10868
Black 66
Asian 76
Native 263
Hispanic/Latino 278
Bachelor's or higher 2518

Districts

Source

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