Summary levels specify the content and the hierarchical relationships of the geographic elements that are required to tabulate and summarize data. In the Summary Level Sequence Chart which follows, the summary level code precedes the summary level area, and symbols are used with special meaning for summary levels: Hyphen "-" separates the elements of a hierarchy. Slash "/" denotes equivalent areas that have different names. Parentheses "()" are not used in the specification for summary levels, but are used occasionally in the usual and customary manner in statements of clarification.

A. State Summary File 3
Geographic component	Summary level
00,01-49,52-95	040 State1
00,01,43,49	050 State-County2
00	060 State-County-County Subdivision
00	070 State-County-County Subdivision-Place/Remainder
00	080 State-County-County Subdivision-Place/Remainder-Census Tract
00	085 State-County-County Subdivision-Place/Remainder-Census Tract-Urban/Rural
00	090 State-County-County Subdivision-Place/Remainder-Census Tract-Urban/Rural-Block Group
00	067 State[PuertoRicoOnly]-County-County Subdivision-Subbarrio3
00	140 State-County-Census Tract
00	144 State-County-Census Tract-American Indian Area/Alaska Native Area/Hawaiian Home Land
00	150 State-County-Census Tract-Block Group
00	154 State-County-Census Tract-BlockGroup-American Indian Area/Alaska Native Area/Hawaiian Home Land
00	160 State-Place
00	155 State-Place-County
00	158 State-Place-County-Census Tract
00	170 State-Consolidated City
00	172 State-Consolidated City-Place Within Consolidated City
00	280 State-American Indian Area/Alaska Native Area/Hawaiian Home Land
00	282 State-American Indian Area/Alaska Native Area/Hawaiian Home Land-County
00	261 State-American Indian Area/Alaska Native Area/Hawaiian Home Land-County-County Subdivision
00	263 State-American Indian Area/Alaska Native Area/Hawaiian Home Land-County-County Subdivision-Place/Remainder
00	283 State-American Indian Area/Alaska Native Area(Reservation or Statistical Entity Only)4
00	285 State-American Indian Area/Alaska Native Area(Reservation or Statistical Entity Only)-County
00	265 State-American Indian Area/Alaska Native Area(Reservation or Statistical Entity Only)-County-County Subdivision
00	266 State-American Indian Area/Alaska Native Area(Reservation or Statistical Entity Only)-County-County Subdivision-Place/Remainder
00	286 State-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land
00	288 State-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land-County
00	267 State-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land-County-County Subdivision
00	268 State-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land-County-County Subdivision-Place/Remainder
00	281 State-American Indian Area/Alaska Native Area/Hawaiian Home Land-Tribal Subdivision/Remainder
00	284 State-American Indian Area/Alaska Native Area(Reservation or Statistical Entity Only)-Tribal Subdivision/Remainder
00	287 State-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land-Tribal Subdivision/Remainder
00	230 State-Alaska Native Regional Corporation
00	390 State-Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area
00	391 State-Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-Central City
00	392 State-Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-County
00	393 State[6 States only CT, ME, MA, NH, RI, VT]-Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-County-County Subdivision
00	395 State-Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area
00	396 State-Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area-County
00	397 State[6 StatesonlyCT,ME,MA,NH,RI,VT]-Consolidated Metropolitan Statistical Area-PrimaryMetropolitan Statistical Area-County-County Subdivision
00	374 State-New England County Metropolitan Area
00	375 State-New England County Metropolitan Area-Central City
00	376 State-New England County Metropolitan Area-County
00	420 State-Urban Area
00	461 State-Urban Area-Central Place
00	463 State-Urban Area-Consolidated City
00	465 State-Urban Area-Consolidated City-Place Within Consolidated City
00	431 State-Urban Area-County
00	441 State-Urban Area-County-County Subdivision
00	451 State-Urban Area-County-County Subdivision-Place/Remainder
00,01,43,52-59,64-71,84,89-95	500 State-Congressional District(106th)
00	510 State-Congressional District(106th)-County
00	511 State-Congressional District(106th)-County-CensusTract
00	521 State-Congressional District(106th)-County-County Subdivision
00	531 State-Congressional District(106th)-Place/Remainder
00	541 State-Congressional District(106th)-Consolidated City
00	542 State-Congressional District(106th)-Consolidated City-Place Within Consolidated City
00	550 State-Congressional District(106th)-American Indian Area/Alaska Native Area/Hawaiian Home Land
00	551 State-Congressional District(106th)-American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)5
00	552 State-Congressional District(106th)-American Indian Area(Off-ReservationTrust LandOnly)/Hawaiian Home Land
00	553 State-Congressional District(106th)-American Indian Area/Alaska Native Area/Hawaiian Home Land-Tribal Subdivision/Remainder
00	554 State-Congressional District(106th)-American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-Tribal Subdivision/Remainder
00	555 State-Congressional District(106th)-American Indian Area(Off-Reservation Trust Land Only)/Hawaiian Home Land-Tribal Subdivision/Remainder
00	560 State-Congressional District(106th)-Alaska Native Regional Corporation
00	851 State-3-digit ZIP Code Tabulation Area
00	852 State-3-digit ZIP Code Tabulation Area-County
00	871 State-5-digit ZIP Code Tabulation Area
00	881 State-5-digit ZIP Code Tabulation Area-County

¹State, District of Columbia, or Puerto Rico.
²Parish in Louisiana, Borough or Census Area in Alaska, and Municipio in Puerto Rico; in Maryland, Missouri, Nevada, and Virginia, one or more cities are independent of counties and are treated as statistical equivalents of counties; the entire District of Columbia, which has no counties, is treated as a county equivalent.
³In Puerto Rico, some subdivisions (barrios-pueblos and barrios) are divided into subminor civil divisions (subbarrios).
⁴American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only) includes American Indian Reservations; Oklahoma Tribal Statistical Areas (OTSAs); Tribal Designated Statistical Areas (TDSAs) (federal areas); State Designated American Indian Statistical Areas (SDAISAs) (state areas); and Alaska Native Village Statistical Areas (ANVSAs) (Alaska).

B. National Summary File 3
Geographic component	Summary level
00,01-49,52-98	010 United States1
00,01-49,52-95	020 Region
00,01-49,52-95	030 Division
00,01-49,52-95	040 State2
00,01,43	050 State-County3
00,01,43	060 State-County-County Subdivision
00	070 State-County-County Subdivision-Place/Remainder
00,50,51	160 State-Place
00,50,51	155 State-Place-County
00,50,51	170 State-Consolidated City
00	172 State-Consolidated City-Place Within Consolidated City
00	500 State-Congressional District(106th)
00	250 American Indian Area/Alaska Native Area/Hawaiian Home Land
00	260 American Indian Area/Alaska Native Area/Hawaiian Home Land-State
00	270 American Indian Area/Alaska Native Area/Hawaiian Home Land-State-County
00	271 American Indian Area/Alaska Native Area/Hawaiian Home Land-State-County-County Subdivision
00	273 American Indian Area/Alaska Native Area/Hawaiian Home Land-State-County-County Subdivision-Place/Remainder
00	252 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)4
00	262 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-State
00	272 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-State-County
00	275 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-State-County-County Subdivision
00	276 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-State-County-County Subdivision-Place/Remainder
00	254 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land
00	264 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land-State
00	274 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land-State-County
00	277 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land-State-County-County Subdivision
00	278 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land-State-County-County Subdivision-Place/Remainder
00	256 Specified American Indian Area5-Tribal Census Tract6
00	291 Specified American Indian Area (ReservationOnly)-Tribal Census Tract
00	292 Specified American Indian Area (Off-Reservation Trust Land Only)-Tribal Census Tract
00	258 Specified American Indian Area-Tribal Census Tract-Tribal Block Group
00	293 Specified American Indian Area (ReservationOnly)-Tribal Census Tract-Tribal Block Group
00	294 Specified American Indian Area (Off-Reservation Trust Land Only)-Tribal Census Tract-Tribal Block Group
00	251 American Indian Area/Alaska Native Area/Hawaiian Home Land-Tribal Subdivision/Remainder
00	253 American Indian Area/Alaska Native Area (Reservation or Statistical Entity Only)-Tribal Subdivision/Remainder
00	255 American Indian Area (Off-Reservation Trust Land Only)/Hawaiian Home Land-Tribal Subdivision/Remainder
00	257 Specified American Indian Area-Tribal Subdivision/Remainder-Tribal Census Tract
00	259 Specified American Indian Area-Tribal Subdivision/Remainder-Tribal Census Tract- Tribal Block Group
00	290 American Indian Area/Alaska Native Area/Hawaiian Home Land-Tribal Subdivision/Remainder- State
00	230 State-Alaska Native Regional Corporation
00,60,63,64,72,80, 83	380 Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area
00,60,63	381 Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-State
00	382 Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-State-Central City
00	383 Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-State-County
00	384 Metropolitan Statistical Area/Consolidated Metropolitan Statistical Area-State[6 states only CT, ME, MA, NH, RI, VT]-County-County Subdivision
00,60,63,80,83	385 Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area
00,60,63	386 Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area- State
00	387 Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area- State- County
00	388 Consolidated Metropolitan Statistical Area-Primary Metropolitan Statistical Area- State[6 states only CT, ME, MA, NH, RI, VT]-County-County Subdivision
00,97,98	370 New England County Metropolitan Area
00	371 New England County Metropolitan Area-State
00	372 New England County Metropolitan Area-State-Central City
00	373 New England County Metropolitan Area-State-County
00,02-03	400 UrbanArea
00,02-03	410 UrbanArea-State
00	460 UrbanArea-State-CentralPlace
00	462 UrbanArea-State-Consolidated City
00	464 UrbanArea-State-Consolidated City-Place Within Consolidated City
00	430 UrbanArea-State-County
00	440 Urban Area-State-County-County Subdivision
00	450 UrbanArea-State-County-County Subdivision-Place/Remainder
00	850 3-digit ZIP Code Tabulation Area
00	860 5-digit ZIP Code Tabulation Area