---
id: "us_census_block_group"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["geo", "government"]
country: ["US"]
langs: ["en"]
quality: 75
url: "https://registry.apicrafter.io/datatype/us_census_block_group"
---

# US census block group GEOID (`us_census_block_group`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Identifier of a census block group, a cluster of census blocks inside one tract, generally with 600 to 3,000 people. The 12-digit GEOID is the 11-digit tract GEOID followed by the block group number, which is the first digit of the block numbers in the group.

- Parent datatype: `us_census_geoid`
- Personal data (PII): no
- Categories: Geographic identifiers (geo), Government related (government)
- Countries: United States (US)
- Languages: English (en)
- Classification: categorical

## Detection

Regular expression (Python `re`):

```
^\d{12}$
```

## Examples

- `482012231001` — Block Group 1, Census Tract 2231, Harris County, TX
- `170830104012` — Block Group 2, Census Tract 104.01, Jersey County, IL
- `48201223100` (invalid example) — 11 digits, a tract GEOID

## Sources

- wikipedia: <https://en.wikipedia.org/wiki/Census_block_group>
- wikidata: <https://www.wikidata.org/wiki/Q5058963>
- doc: <https://www.census.gov/programs-surveys/geography/guidance/geo-identifiers.html>

## Quality

Score 75/100. Missing: mapping (Wikidata, Schema.org, ...), translation, detector coverage.

JSON: <https://registry.apicrafter.io/api/v1/datatypes/us_census_block_group.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/US/geo/us_census_block_group.yaml>