Cook County Assessed Values: Mailed, Certified and Board of Review Values by PIN

cookcountyopendata/assessed-values

The Cook County, Illinois Assessor's assessed values for one parcel by its 14-digit PIN, one row per tax year, newest first: property class, township, neighborhood, and the mailed, certified and Board of Review values split into building, land and total (plus the home improvement exemption amounts). Optionally narrow to one tax year (1999 onward) and set how many years to return (1 to 30, default 5). An empty list means the PIN has no assessed values. Cook County Assessor's Office data, passed through unmodified and served by Eden Engine; not an official Cook County product.

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

Cook County Assessor's Office (Cook County, Illinois)

Data from the Cook County Assessor's Office (Cook County, Illinois) via the Cook County open data portal (datacatalog.cookcountyil.gov), passed through unmodified. Served by Eden Engine; not an official Cook County product.

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.

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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: "cookcountyopendata/assessed-values" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "cookcountyopendata/assessed-values" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "cookcountyopendata/assessed-values", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "cookcountyopendata/assessed-values", 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 21, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "pin"
  ],
  "properties": {
    "pin": {
      "type": "string",
      "pattern": "^[0-9]{14}$",
      "description": "The parcel's 14-digit Parcel Index Number (PIN) with no dashes, zero-padded, for example 32213210090000."
    },
    "year": {
      "type": "integer",
      "maximum": 2100,
      "minimum": 1999,
      "description": "Only this tax year (4 digits). Omit for every year, newest first."
    },
    "limit": {
      "type": "integer",
      "default": 5,
      "maximum": 30,
      "minimum": 1,
      "description": "How many tax-year rows to return, 1 to 30; defaults to 5."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "pin": {
            "type": "string",
            "description": "The 14-digit parcel index number."
          },
          "nbhd": {
            "type": "string",
            "description": "Assessor neighborhood code."
          },
          "year": {
            "type": "string",
            "description": "Tax year, as text."
          },
          "class": {
            "type": "string",
            "description": "Assessor property class code."
          },
          "row_id": {
            "type": "string"
          },
          "board_tot": {
            "type": "string"
          },
          "board_bldg": {
            "type": "string",
            "description": "Board of Review building value."
          },
          "board_land": {
            "type": "string"
          },
          "mailed_tot": {
            "type": "string",
            "description": "Mailed total value."
          },
          "mailed_bldg": {
            "type": "string",
            "description": "Mailed building value, dollars as text."
          },
          "mailed_land": {
            "type": "string",
            "description": "Mailed land value."
          },
          "certified_tot": {
            "type": "string"
          },
          "township_code": {
            "type": "string"
          },
          "township_name": {
            "type": "string"
          },
          "certified_bldg": {
            "type": "string"
          },
          "certified_land": {
            "type": "string"
          }
        },
        "additionalProperties": true
      },
      "description": "One object per row; every value is a string except where noted."
    }
  },
  "description": "The matching assessed-value rows, newest tax year first.",
  "additionalProperties": true
}