TIGERweb Boundary at a Point

tigerweb/point-lookup

Finds the current United States boundary of a chosen layer that contains a longitude and latitude (WGS84) and returns its GEOID, name, feature class code, land and water area (square metres) and centroid; no geometry. Layers: 80 states, 82 counties, 8 tracts, 28 incorporated places, 30 designated places, 93 metropolitan statistical areas, 2 ZIP code tabulation areas. For example layer 8 at -122.4194, 37.7749 returns the San Francisco tract containing it. A point outside the United States, or one that falls in no boundary of that layer (for example a rural point on the places layers), returns an empty `features` array.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $0.50.

Data source

U.S. Census Bureau

Boundary data from TIGERweb, U.S. Census Bureau, a work of the United States government, passed through unmodified. Served by Eden Engine. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

Connect once and your AI can find and run this tool, and any other it needs.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "tigerweb/point-lookup" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "tigerweb/point-lookup" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "tigerweb/point-lookup", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "tigerweb/point-lookup", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 25, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "layer",
    "lon",
    "lat"
  ],
  "properties": {
    "lat": {
      "type": "number",
      "maximum": 90,
      "minimum": -90,
      "description": "Latitude in decimal degrees (WGS84), for example 37.7749."
    },
    "lon": {
      "type": "number",
      "maximum": 180,
      "minimum": -180,
      "description": "Longitude in decimal degrees (WGS84), for example -122.4194."
    },
    "layer": {
      "enum": [
        "80",
        "82",
        "8",
        "28",
        "30",
        "93",
        "2"
      ],
      "type": "string",
      "description": "Boundary layer: 80 = states, 82 = counties, 8 = tracts, 28 = incorporated places, 30 = designated places, 93 = metropolitan and micropolitan statistical areas, 2 = ZIP code tabulation areas."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "features"
  ],
  "properties": {
    "features": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "attributes"
        ],
        "properties": {
          "attributes": {
            "type": "object",
            "description": "GEOID (the boundary's code), NAME, BASENAME, MTFCC (feature class code), AREALAND and AREAWATER (square metres), CENTLAT and CENTLON (centroid), INTPTLAT and INTPTLON (internal point), all as sent by the service.",
            "additionalProperties": true
          }
        },
        "additionalProperties": true
      },
      "description": "One entry per matching boundary; empty when nothing matches."
    },
    "exceededTransferLimit": {
      "type": "boolean",
      "description": "True when more boundaries match than were returned; page with offset."
    }
  },
  "additionalProperties": true
}