Current List of ClassFP Codes
| ClassFP Code | Class Code Description | Associated Geographic Entity |
| C1 | An active incorporated place that does not serve as a county subdivision equivalent | Economic Census Place, Incorporated Place |
| C2 | An active incorporated place that is legally coextensive with a county subdivision but treated as independent of any county subdivision | County Subdivision, Economic Census Place, Incorporated Place |
| C3 | Consolidated City | Consolidated City |
| C4 | Alternate official common name for an incorporated place | Locality Point |
| C5 | An active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent | County Subdivision, Economic Census Place, Incorporated Place |
| C6 | An active incorporated place that partially is independent of any county subdivision and serves as a county subdivision equivalent or partially coextensive with a county subdivision but treated as independent of any county subdivision | Incorporated Place |
| C7 | An incorporated place that is independent of any county | County or Equivalent Feature, County Subdivision, Economic Census Place, Incorporated Place |
| C8 | The balance of a consolidated city excluding the separately incorporated place(s) within that consolidated government | Economic Census Place, Incorporated Place |
| C9 | An inactive or nonfunctioning incorporated place | Economic Census Place, Incorporated Place |
| M1 | A military or other defense installation that is not entirely within a census designated place | Locality Point, Military Installation |
| M2 | A military or other defense installation entirely within a place | Census Designated Place, Economic Census Place, Military Installation |
| U1 | A census designated place with an official federally recognized name | Census Designated Place, Economic Census Place |
| U2 | A census designated place without an official federally recognized name | Census Designated Place, Economic Census Place |
CityType Code Definitions
Code | Description |
|---|---|
| N | Non Postal Community Name: Former Postal Facility |
| P | Post Office: Official post office branch. |
| U | Urbanization: Specific to Puerto Rico. |
| B | Branch: A postal facility that is not the main post office and is outside the corporate limits of a city. |
| C | Community Post Office: a contract postal unit providing mail services to small communities. |
| S | Station: A post office that is not the main office for a city but is in corporate city limits. |
| Z | PO Box: Linked to a set of PO Boxes. |
| X | Military: Linked to an APO/FPO Military base. |
