| CODE | DESCRIPTION |
| A1 | ADDRESS MATCHING-HOUSE NUMBER |
| A2 | ADDRESS MATCHING-BLOCK FACE |
| A3 | ADDRESS MATCHING-STREET CENTERLINE |
| A4 | ADDRESS MATCHING-NEAREST INTERSECTION |
| A5 | ADDRESS MATCHING-PRIMARY NAME |
| A6 | ADDRESS MATCHING-DIGITIZED |
| AO | ADDRESS MATCHING-OTHER |
| AU | ADDRESS MATCHING-UNKNOWN |
| C1 | CENSUS BLOCK-1990-CENTROID |
| C2 | CENSUS BLOCK/GROUP-1990-CENTROID |
| C3 | CENSUS BLOCK TRACT-1990-CENTROID |
| CO | CENSUS-OTHER |
| CU | CENSUS-UNKNOWN |
| G1 | GPS-CARRIER/GEODETIC |
| G2 | GPS-CODE/GEODETIC |
| G3 | GPS-KINEMATIC |
| GO | GPS-OTHER |
| GU | GPS-UNKNOWN |
| I1 | INTERPOLATION-MAP |
| I2 | INTERPOLATION-PHOTO |
| I3 | INTERPOLATION-SATELLITE |
| IO | INTERPOLATION-OTHER |
| IU | INTERPOLATION-UNKNOWN |
| L1 | LORAN C |
| P1 | PUBLIC-LAND-SURVEY-QUARTERING |
| P2 | PUBLIC-LAND-SURVEY-FOOTING |
| Z1 | ZIPCODE-CENTROID |
| UN | UNKNOWN |
| OT | OTHER |
