Files
republic-os/data/jurisdictions/us/states/va/counties/montgomery/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 Montgomery County, VA county 51121 VA
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
99101 15115 70028 13958 72715 23.95 55.3 2.93 304600 0.5104 13.63 81034 3878 6434 189 4602 42057
to rel area_weight
us/states/va/districts/09 in-district 1.0
to rel area_weight
us/states/va/districts/senate/4 in-district 0.5908
to rel area_weight
us/states/va/districts/senate/5 in-district 0.409
to rel area_weight
us/states/va/districts/house/41 in-district 0.8392
to rel area_weight
us/states/va/districts/house/42 in-district 0.1606
field source
demographics Census ACS 2023
field source
districts PostGIS area-intersection over Census TIGER 2024 boundaries
official
jurisdiction
county
va
2026-07-03

Montgomery County, VA

County jurisdiction.

Demographics (ACS 2023)

Measure Value
Population 99101
Under 18 15115
1864 70028
65+ 13958
Median household income 72715
Poverty rate 23.95
Homeownership rate 55.3
Unemployment rate 2.93
Median home value 304600
Gini index 0.5104
Vacancy rate 13.63
White 81034
Black 3878
Asian 6434
Native 189
Hispanic/Latino 4602
Bachelor's or higher 42057

Districts

Source

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