US Census Bureau
TIGERweb REST Services

ArcGIS REST services exposing the canonical Census TIGER/Line geographic boundary layers — states, counties, tracts, block groups, blocks, ZIP Code Tabulation Areas, congressional districts, school districts, Public Use Microdata Areas, urban areas, and more. Returns GeoJSON, Esri JSON, KML, and PBF. No API key required.
TIGERweb REST Services is one of 7 APIs that US Census Bureau publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
This API exposes 1 machine-runnable capability that can be deployed as REST, MCP, or Agent Skill surfaces via Naftiko.
Tagged areas include Government, Geospatial, GIS, Boundaries, and Mapping. The published artifact set on APIs.io includes API documentation, an OpenAPI specification, and 1 Naftiko capability spec.
Documentation GitHub OpenAPI
OpenAPI Specification

openapi: 3.1.0
info:
  title: TIGERweb REST Services
  description: |
    ArcGIS REST endpoints that expose the canonical TIGER/Line geographic
    boundary layers — states, counties, census tracts, block groups, blocks,
    ZIP Code Tabulation Areas (ZCTAs), congressional districts, school
    districts, urban areas, and Public Use Microdata Areas — for current
    vintages and the 2010 and 2020 census decades.

    These are public ArcGIS Server endpoints; no API key is required. Spatial
    queries return GeoJSON, Esri JSON, KML, or PBF based on the `f` parameter.
  version: '2026-05-25'
  contact:
    name: Census Bureau Geography Division
    url: https://www.census.gov/programs-surveys/geography.html
  license:
    name: Public Domain
    url: https://www.usa.gov/government-works
servers:
- url: https://tigerweb.geo.census.gov/arcgis/rest/services
  description: TIGERweb ArcGIS REST production
tags:
- name: Catalog
  description: Service directory
- name: Current
  description: Current vintage TIGERweb services
- name: 2020
  description: 2020 census vintage services
- name: 2010
  description: 2010 census vintage services
paths:
  /:
    get:
      summary: List TIGERweb Service Catalog
      description: Returns the directory of folders and services hosted by the TIGERweb ArcGIS instance.
      operationId: getServiceCatalog
      tags:
      - Catalog
      parameters:
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Service catalog
          content:
            application/json:
              schema:
                type: object
  /TIGERweb/State_County/MapServer:
    get:
      summary: Get States And Counties Map Service
      description: Returns metadata for the State_County map service including layer list and capabilities.
      operationId: getStateCountyService
      tags:
      - Current
      parameters:
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Map service metadata
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MapServiceInfo'
  /TIGERweb/State_County/MapServer/{layerId}/query:
    get:
      summary: Query States And Counties Features
      description: |
        Spatial / attribute query against the State_County map service. Use
        layer 0 for states and layer 1 for counties.
      operationId: queryStateCountyLayer
      tags:
      - Current
      parameters:
      - $ref: '#/components/parameters/LayerIdParam'
      - $ref: '#/components/parameters/WhereParam'
      - $ref: '#/components/parameters/OutFieldsParam'
      - $ref: '#/components/parameters/GeometryParam'
      - $ref: '#/components/parameters/GeometryTypeParam'
      - $ref: '#/components/parameters/SpatialRelParam'
      - $ref: '#/components/parameters/InSRParam'
      - $ref: '#/components/parameters/OutSRParam'
      - $ref: '#/components/parameters/ReturnGeometryParam'
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Feature collection
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeatureCollection'
  /TIGERweb/Tracts_Blocks/MapServer/{layerId}/query:
    get:
      summary: Query Census Tracts And Blocks Features
      description: Query census tract, block group, and block layers from the Tracts_Blocks service.
      operationId: queryTractsBlocksLayer
      tags:
      - Current
      parameters:
      - $ref: '#/components/parameters/LayerIdParam'
      - $ref: '#/components/parameters/WhereParam'
      - $ref: '#/components/parameters/GeometryParam'
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Feature collection
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeatureCollection'
  /TIGERweb/PUMA_TAD_TAZ_UGA_ZCTA/MapServer/{layerId}/query:
    get:
      summary: Query PUMAs And ZIP Code Tabulation Areas
      description: Query PUMA, traffic analysis district/zone, urban growth area, and ZCTA layers.
      operationId: queryPumaZctaLayer
      tags:
      - Current
      parameters:
      - $ref: '#/components/parameters/LayerIdParam'
      - $ref: '#/components/parameters/WhereParam'
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Feature collection
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeatureCollection'
  /Census2020/State_County/MapServer/{layerId}/query:
    get:
      summary: Query 2020 Census State And County Features
      description: Query the 2020 census vintage State_County map service.
      operationId: query2020StateCounty
      tags:
      - '2020'
      parameters:
      - $ref: '#/components/parameters/LayerIdParam'
      - $ref: '#/components/parameters/WhereParam'
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Feature collection
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeatureCollection'
  /Census2010/State_County/MapServer/{layerId}/query:
    get:
      summary: Query 2010 Census State And County Features
      description: Query the 2010 census vintage State_County map service.
      operationId: query2010StateCounty
      tags:
      - '2010'
      parameters:
      - $ref: '#/components/parameters/LayerIdParam'
      - $ref: '#/components/parameters/WhereParam'
      - $ref: '#/components/parameters/FormatParam'
      responses:
        '200':
          description: Feature collection
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FeatureCollection'
components:
  parameters:
    LayerIdParam:
      name: layerId
      in: path
      required: true
      description: Numeric ArcGIS layer ID within the parent map service.
      schema:
        type: integer
    WhereParam:
      name: where
      in: query
      required: false
      description: SQL-like WHERE clause filtering attributes.
      schema:
        type: string
    OutFieldsParam:
      name: outFields
      in: query
      required: false
      description: Comma-separated list of fields to return (use `*` for all).
      schema:
        type: string
        default: '*'
    GeometryParam:
      name: geometry
      in: query
      required: false
      description: Geometry filter as JSON, envelope, point, polyline, or polygon.
      schema:
        type: string
    GeometryTypeParam:
      name: geometryType
      in: query
      required: false
      schema:
        type: string
        enum: [esriGeometryPoint, esriGeometryMultipoint, esriGeometryPolyline, esriGeometryPolygon, esriGeometryEnvelope]
    SpatialRelParam:
      name: spatialRel
      in: query
      required: false
      schema:
        type: string
        enum: [esriSpatialRelIntersects, esriSpatialRelContains, esriSpatialRelCrosses, esriSpatialRelEnvelopeIntersects, esriSpatialRelIndexIntersects, esriSpatialRelOverlaps, esriSpatialRelTouches, esriSpatialRelWithin]
        default: esriSpatialRelIntersects
    InSRParam:
      name: inSR
      in: query
      required: false
      description: Input spatial reference WKID.
      schema:
        type: integer
    OutSRParam:
      name: outSR
      in: query
      required: false
      description: Output spatial reference WKID.
      schema:
        type: integer
    ReturnGeometryParam:
      name: returnGeometry
      in: query
      required: false
      schema:
        type: boolean
        default: true
    FormatParam:
      name: f
      in: query
      required: false
      description: Output format.
      schema:
        type: string
        enum: [json, geojson, pjson, kmz, pbf, html]
        default: json
  schemas:
    MapServiceInfo:
      type: object
      properties:
        currentVersion:
          type: number
        serviceDescription:
          type: string
        mapName:
          type: string
        description:
          type: string
        copyrightText:
          type: string
        layers:
          type: array
          items:
            type: object
            properties:
              id:
                type: integer
              name:
                type: string
              type:
                type: string
        spatialReference:
          type: object
          properties:
            wkid:
              type: integer
            latestWkid:
              type: integer
    FeatureCollection:
      type: object
      properties:
        type:
          type: string
          example: FeatureCollection
        features:
          type: array
          items:
            type: object
            properties:
              type:
                type: string
              geometry:
                type: object
              properties:
                type: object
TIGERweb REST Services

Documentation

Specifications

Other Resources

OpenAPI Specification
