12 attribute fields, profiled from the October 2022 vintage.
Columns in Mason County
| Field | Type | Filled | Distinct | Example values |
|---|---|---|---|---|
| pid | OFTString | 16.2k | 5, 6, 7 | |
| owner1 | OFTString | 7.7k | PERKINS MARK A ET UX, STEFFES WILLIAM C ET UX, FORNOFF RANDALL R ET AL | |
| owner2 | OFTString | 1.2k | BOWMAN STEFFES SARAH A ET VIR, FORNOFF RANDALL R, OBRYANT JANICE ET VIR | |
| owner1addr | OFTString | 6.4k | 18428 CR 1680E HAVANA IL 62644, 1539 GUILDFORD DR BOURBONNAIS IL 60914, 18478 QUIVER BEACH RD HAVANA IL 62644 | |
| owner2addr | OFTString | 429 | 18142 E MANITO RD HAVANA IL 62644, 6570 MASON RD MANITO IL 61546, 6570 MASON RD MANITO IL 61546 | |
| situs | OFTString | 6.8k | 18428 CR 1680E IL, 18540 QUIVER BEACH RD HAVANA IL 62644, 18478 QUIVER BEACH RD IL | |
| mailto | OFTString | 6.5k | 18428 CR 1680E HAVANA IL 62644, 1539 GUILDFORD DR BOURBONNAIS IL 60914, 18142 E MANITO RD HAVANA IL 62644 | |
| legal | OFTString | 15.3k | 1.89AC CENT PT E1/2 SW1/4 NE1/4 30 22 8 126, LANE'S SUB-DIV LTS 5 6 126, PT W1/2 SW1/4 31 22 8 126 GREEN 5 SHEET 20 | |
| parcel_id | OFTString | 15.5k | 0530200013, 0530101003, 0531300001 | |
| alt_pid | OFTString | 15.5k | 05-11-240-02, 05-13-920-00, 05-14-740-00 | |
| acreage | OFTString | 4.2k | 1.890, .000, 39.480 | |
| zoning | OFTString | — |
Why this differs from the next county over
There is no national parcel schema. Every assessor's office built its own, usually decades ago, usually inside whatever CAMA system it bought at the time. One county's owner column is OWNER_NAME, the next one's is own1, and a third splits it across four fields. Shapefile's ten-character DBF limit truncated a generation of them into things like TOTLNDVAL.
Nothing here is renamed or remapped. The columns above are exactly what is in the file, because a normalisation layer that quietly guesses wrong is worse than no normalisation at all — and every guess it makes is one you cannot audit.
The Filled column is the share of rows with a real value. Placeholder text such as n/a counts as empty; a column that is 100% present but 90% placeholder is a column that will disappoint you, and the profiler treats it accordingly.