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Geography

Geography is fundamental to almost everything we do. The table below shows a summary of key political and statistical geography. This table is based partly on ACS 2018 tabulation areas published.

Geography	1-year estimates 65,000+ population		1-year Supplemental Estimates 20,000+ population		5-year estimates All Areas
	number	percent	number	percent	number
United States	1	100%	1	100%	1
Region	4	100%	4	100%	4
Division	9	100%	9	100%	9
States, the District of Columbia, and Puerto Rico	52	100%	52	100%	52
County or equivalent /1	838	26%	1,910	59%	3,220
County Subdivision /2	226	1%	1,186	3%	36,630
Subminor Civil Division (Puerto Rico Only) /3	N/A	N/A	N/A	N/A	145
Census Tract /3	N/A	N/A	N/A	N/A	74,001
Block Group /3	N/A	N/A	N/A	N/A	220,333
Place (incorporated places and census designated places)	630	2%	2,323	8%	29,573
Consolidated City /3	N/A	N/A	N/A	N/A	8
Alaska Native Regional Corporation	3	25%	4	33%	12
American Indian Area/Alaska Native Area/Hawaiian Home Land	13	2%	34	5%	695
American Indian Area-Tribal Census Tract /3	N/A	N/A	N/A	N/A	483
American Indian Area-Tribal Census Tract-Tribal Block Group /3	N/A	N/A	N/A	N/A	917
Metropolitan Statistical/Micropolitan Statistical Area /4	519	55%	914	97%	945
Principal City of Metropolitan or Micropolitan Statistical Areas	402	32%	786	62%	1,265
Metropolitan Division	31	100%	31	100%	31
Combined Statistical Area	171	98%	174	100%	174
Combined New England City and Town Area	7	100%	7	100%	7
New England City and Town Area	25	62%	36	92%	39
Principal Cities of New England City and Town Areas	19	32%	43	71%	59
New England City and Town Area Division	10	100%	10	100%	10
Urban Area	435	12%	881	25%	3,592
Congressional Districts - 116th	435	100%	435	100%	435
Delegate District - 115th (at Large, District of Columbia)	1	100%	1	100%	1
Resident Commissioner District - 115th (at Large, Puerto Rico)	1	100%	1	100%	1
State Legislative District /3, /5 (Upper)	N/A	N/A	N/A	N/A	1,961
State Legislative District /3, /5 (Lower)	N/A	N/A	N/A	N/A	4,833
Public Use Microdata Area	2,378	100%	2,378	100%	2,378
5 digit ZIP Code Tabulation Area /3	N/A	N/A	N/A	N/A	33,120
School District (Elementary)	81	4%	297	15%	1,995
School District (Secondary)	90	18%	211	42%	507
School District (Unified)	874	8%	3,007	28%	10,897
ACS Total	7,233	2%	14,701	3%	428,284
Census Blocks
Voting Precincts

Notes ...
School Districts are for 2017-18 school year.
State Legislative Districts are for 2018 Legislative Session.
CBSAs, MDs, NECTAs are as of August 15, 2017.
1 County equivalents include Alaska boroughs, municipalities, city and boroughs, and census areas;
    Louisiana parishes; Puerto Rico municipios; independent cities in Maryland, Missouri, Nevada, and Virginia.
2 For 1-year estimates, qualifying Minor Civil Divisions in 20 states only. For 5-year estimates, all county subdivisions.
3 1-year estimates are not produced for this geographic level, regardless of population size.
4 All metropolitan statistical areas receive ACS 1-year estimates.
    A population minimum of 50,000 is applied instead of the standard 65,000.
5 Legislative session year 2018.
* Counts based on geographic area boundaries as of January 1, 2018.
** ACS data are not available for census blocks.