Census Geographies¶
Census geographies exist within a hierarchy. Each level in this hierarchy has a three-digit summary level code associated with it. For instance, counties nest within states, and are assigned the summary level code 050. Following is a table showing all the summary levels recognized by this package:
| Summary Level | Summary Level Code |
|---|---|
| us | 010 |
| region | 020 |
| division | 030 |
| state | 040 |
| state> county | 050 |
| state> county> county subdivision | 060 |
| state> county> county subdivision> subminor civil division | 067 |
| state> county> county subdivision> place/remainder (or part) | 070 |
| state> county> county subdivision> place > tract (or part) | 080 |
| state> county> tract> block | 101 |
| state> county> tract | 140 |
| state> county> tract> block group | 150 |
| state> place> county (or part) | 155 |
| state> place | 160 |
| state> consolidated city | 170 |
| state> consolidated city> place (or part) | 172 |
| state> alaska native regional corporation | 230 |
| american indian area/alaska native area/hawaiian home land | 250 |
| american indian area/alaska native area/hawaiian home land> tribal subdivision/remainder | 251 |
| american indian area/alaska native area (reservation or statistical entity only) | 252 |
| american indian area (off-reservation trust land only)/hawaiian home land | 254 |
| american indian area/alaska native area/hawaiian home land> tribal census tract | 256 |
| american indian area/alaska native area/hawaiian home land> tribal census tract> tribal block group | 258 |
| american indian area/alaska native area/hawaiian home land> state | 260 |
| american indian area/alaska native area/hawaiian home land> state> place/remainder | 269 |
| american indian area/alaska native area/hawaiian home land> state> county | 270 |
| state> american indian area/alaska native area/hawaiian home land (or part) | 280 |
| state> american indian area> tribal subdivision/remainder (or part) | 281 |
| state> american indian area/alaska native area (reservation or statistical entity only) (or part) | 283 |
| state> american indian area (off-reservation trust land only)/hawaiian home land (or part) | 286 |
| american indian area/alaska native area/hawaiian home land> tribal subdivision/remainder> state | 290 |
| american indian area/alaska native area/hawaiian home land> tribal census tract (or part) within aia (reservation only) | 291 |
| american indian area/alaska native area/hawaiian home land> tribal census tract (or part) within aia (trust land only) | 292 |
| american indian area/alaska native area/hawaiian home land> tribal census tract> tribal block group (or part) within tribal census tract within aia (reservation only) | 293 |
| american indian area/alaska native area/hawaiian home land> tribal census tract> tribal block group (or part) within tribal census tract within aia (trust land only) | 294 |
| metropolitan statistical area/micropolitan statistical area | 310 |
| metropolitan statistical area/micropolitan statistical area> state | 311 |
| metropolitan statistical area/micropolitan statistical area> state> principal city | 312 |
| metropolitan statistical area/micropolitan statistical area> metropolitan division | 314 |
| metropolitan statistical area> metropolitan division> state | 315 |
| state> metropolitan statistical area/micropolitan statistical area (or part) | 320 |
| state> metropolitan statistical area/micropolitan statistical area> principal city (or part) | 321 |
| state> metropolitan statistical area/micropolitan statistical area> county | 322 |
| state> metropolitan statistical area/micropolitan statistical area> metropolitan division (or part) | 323 |
| state> metropolitan statistical area/micropolitan statistical area> metropolitan division> county | 324 |
| combined statistical area | 330 |
| combined statistical area> state | 331 |
| combined statistical area> micropolitan statistical area | 332 |
| combined statistical area> metropolitan statistical area/micropolitan statistical area> state | 333 |
| combined new england city and town area | 335 |
| combined new england city and town area> state | 336 |
| combined new england city and town area> new england city and town area | 337 |
| combined new england city and town area> new england city and town area> state | 338 |
| state> combined statistical area (or part) | 340 |
| state> combined statistical area> metropolitan statistical area/micropolitan statistical area (or part) | 341 |
| state> combined new england city and town area (or part) | 345 |
| state> combined new england city and town area> new england city and town area (or part) | 346 |
| new england city and town area | 350 |
| new england city and town area> state | 351 |
| new england city and town area> state> principal city | 352 |
| new england city and town area> necta division | 355 |
| new england city and town area> necta division> state | 356 |
| state> new england city and town area (or part) | 360 |
| state> new england city and town area> place | 361 |
| state> new england city and town area> county (or part) | 362 |
| state> new england city and town area> county> county subdivision | 363 |
| state> new england city and town area> necta division (or part) | 364 |
| state> new england city and town area> necta division> county (or part) | 365 |
| state> new england city and town area> necta division> county> county subdivision | 366 |
| urban area | 400 |
| urban area> state | 410 |
| urban area> state> county | 430 |
| state> congressional district | 500 |
| state> congressional district> county | 510 |
| state> congressional district> county> tract | 511 |
| state> congressional district> county> county subdivision | 521 |
| state> congressional district> place | 531 |
| state> congressional district> american indian area/alaska native area/hawaiian home land | 550 |
| state> congressional district> alaska native regional corporation | 560 |
| state> state legislative district (upper chamber) | 610 |
| state> state legislative district (upper chamber)> county | 612 |
| state> state legislative district (lower chamber) | 620 |
| state> state legislative district (lower chamber)> county (or part) | 622 |
| state> public use microdata area | 795 |
| zip code tabulation area | 860 |
| state> zip code tabulation area (or part) | 871 |
| state> school district (elementary) | 950 |
| state> school district (secondary) | 960 |
| state> school district (unified) | 970 |
Individual geographies are identified by Federal Information Processing Standards (FIPS) codes. Each level of geography has its own set of FIPS codes. For instance, each county is identified by the 2-digit FIPS code for the state in which the county is located, together with a 3-digit FIPS code identifying the county within the state. As an example, Cook County, Illinois would be identified by state FIPS code 17 and county FIPS code 031.
This package includes the censusgeo class for representing Census geographies. It also provides the geographies function to look up Census geographies.