U.S. City Open Data Census
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Data about assessed property values including location, assessed value, taxes owed, and owner. Many US cities raise a substantial percentage of annual revenue via property tax assessment. Transparent public access to property assessment data helps keep city tax assessors accountable, allowing property owners to see how their property has been assessed relative to other parcels and providing explanatory context for property taxes owed and/or helping to justify appeals to assessments perceived to be unfair. Property assessment data also helps the public keep property owners accountable. (More info)
| Question | Answer | Comment |
|---|---|---|
| Openly licensed | Yes | |
| Available in bulk | Yes | |
| Up-to-date | Yes | This data is updated on a quarterly basis with the parcel data. |
| Available free online | Yes | |
| Available free of charge | Yes | |
| In an open format | DBF, SHP, SHX, XML | |
| findable | 3 | see response for parcel data (because this data is actually contained within the parcel data set, so that all tax assessment is automatically geographically linked to parcel polygons) |
| findable_steps | I went to the CAGIS homepage (where I was directed via google search for this data), went to the free GIS layer download link, and followed instructions for downloading CAGIS open data quarterly. This file was inside that downloadable zipfile. | |
| licence_url | https://cagismaps.hamilton-co.org/cagisportal/cagisHome/ | |
| Collected by government | Yes | |
| usability | 2 | This was easily consumable in any software that will read one of the above data formats (including many free downloadable solutions, like Tableau Public). |
| collector_name | Cincinnati Area Geographic Information Systems (CAGIS) | For more information about CAGIS: https://cagismaps.hamilton-co.org/cagisportal/ |
| characteristics | Location (may be an address or parcel number), Land area, Property details (type, use, units, description, and/or built improvements, etc.), Assessed value, Taxes owed, Property owner | |
| location | href="https://cagis.org/Opendata/?" https://cagis.org/Opendata/?">rel="nofollow">https://cagis.org/Opendata/? - CAGIS Free GIS layer download site |
