Assessor - Assessed Values — Cook County

Land, building, and total assessed values for all Cook County parcels, from 1999 to present. The Assessor's Office uses these values for reporting, evaluating assessment performance over time, and research. When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded. This data is parcel-level. This Actor returns it as one flat JSON row per record, with 19 declared fields — typed, named and documented in the dataset schema, so a spreadsheet or an agent can use it without guessing.

What you get

Field	Type	Meaning
board_hie	number	board_hie
township_code	number	township_code
class	string	class
township_name	string	township_name
nbhd	number	neighborhood_code
mailed_hie	number	mailed_hie
certified_land	number	certified_land
certified_tot	number	certified_tot
certified_hie	number	certified_hie
pin	number	pin
year	number	tax_year
mailed_bldg	number	mailed_bldg
board_land	number	board_land
board_tot	number	board_tot
row_id	number	row_id
mailed_tot	number	mailed_tot
mailed_land	number	mailed_land
certified_bldg	number	certified_bldg
board_bldg	number	board_bldg

Every row also carries sourceRowId, sourceUpdatedAt and scrapedAt, so a pipeline can tell one record from another and know exactly when it was read.

{
  "board_hie": 0,
  "township_code": 12,
  "class": "202",
  "township_name": "Bloom",
  "nbhd": 12111,
  "mailed_hie": 0,
  "certified_land": 1007,
  "certified_tot": 3294
}

Inputs

Field	What it does
Filter (SoQL)	Applied at the source, so a narrow question fetches a narrow page instead of downloading everything.
Order	Empty keeps the publisher's own order; set a column to sort, for example amount DESC.
Maximum rows	Hard cap. The source is paged 1,000 rows at a time.
Time budget	Stops cleanly and reports how far it got.
Pause between pages	Keeps the run inside the publisher's rate limits.

Limitations

• This is one dataset, from one publisher. It is the Assessor - Assessed Values dataset as Cook County Assessor's Office publishes it — not a national or cross-city equivalent, and not a merge with other sources.
• The publisher can change it. Columns are added, renamed and retired upstream; the field list here is the schema the Actor was generated from. A renamed column arrives as a new field only after the Actor is updated.
• Fields are typed from live records. A column that was empty in the sample is declared as text; a value that does not fit the declared type comes back null rather than being coerced into a wrong number.
• Records are what the publisher publishes. No geocoding, no de-duplication across datasets, no enrichment.
• Freshness is the publisher's. The data was last changed upstream on 2026-10-15. Where the publisher supplies a row timestamp it appears as sourceUpdatedAt; scrapedAt records when this Actor read the row.

Why this is different

• Assessor - Assessed Values — Cook County declares all 19 of its output fields in the dataset schema, each with a type, a description and an example.
• The Actor reads the Assessor - Assessed Values dataset directly from Cook County Open Data; no key, login or account is needed.
• Filters run at the source with SoQL, so a narrow request returns a narrow page rather than a full download.
• Every row is flat JSON: nested location objects become latitude and longitude, and no field holds a nested object.
• The row id is stable, so the same request de-duplicates instead of returning the same record twice.

FAQ

Do I need an API key? No. Cook County Open Data publishes this dataset openly.

How fresh is it? The Actor reads the dataset live. scrapedAt records when each row was read, and sourceUpdatedAt carries the publisher's own row timestamp where it supplies one.

Can I filter by date or status? Yes — use the Filter field with SoQL, for example status = 'Active'.

What happens if my filter is wrong? The run stops with the portal's own message and the hint to check SoQL, rather than returning an empty dataset that looks like "no data".

Is this the whole dataset? Up to your row cap, paged 1,000 at a time. Raise the cap to read more.

What is sourceRowId? The publisher's own row id when it supplies one, otherwise a stable hash of the row. Either way it is what makes de-duplication and joins possible.

Pricing

Pay per result: $0.0005 per row. Each stored dataset row is billed, including any diagnostic row returned instead of results.

An Actor-start event is also charged at $0.0001 per GB of allocated memory (minimum one event), even if no rows are returned. At 1 GB or less, 1,000 result rows cost $0.5001 before any applicable Store discount.

Data source

Cook County Open Data — Assessor - Assessed Values, published by Cook County Assessor's Office. Public data under the portal's open-data terms.