Ever wonder what a table ID represents? The characters may look random at first glance, but each American Community Survey (ACS) table ID is purposefully numbered to describe its content and format. For example, the characters in B06004APR show that the table contains place of birth statistics for the white alone population in Puerto Rico.

ACS table IDs consist of up to five elements. To learn more about the numbering system, drill into each of the following elements below:

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Table ID Characters	Type of Table		Contains
B	Detailed Tables	Base Table	Most detailed estimates on all topics for all geographies
C	Detailed Tables	Collapsed Table	Similar information from its corresponding Base Table (B) but at a lower level of detail because one or more lines in the Base Table have been grouped together
S	Subject Table		A span of information on a particular ACS subject, such as veterans, presented in the format of both estimates and percentages
R	Ranking Table		State rankings across approximately 90 key variables
GCT	Geographic Comparison Table		Comparisons across approximately 95 key variables for geographies other than states such as counties or congressional districts
K20	Supplemental Estimates		Simplified Detailed Tables at a lower population threshold than the standard 1-year tables (all areas with populations of 20,000 or more)
XK	Experimental Estimates		Experimental estimates, which are different from the standard ACS data releases
DP	Data Profile		Broad social, economic, housing, and demographic information in a total of four profiles
NP	Narrative Profile		Summaries of information in the Data Profiles using nontechnical text
CP	Comparison Profile		Comparisons of ACS estimates over time in the same layout as the Data Profiles
S0201	Selected Population Profile		Broad ACS statistics for population subgroups by race, ethnicity, ancestry, tribal affiliation, and place of birth

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The next 2 characters identify the subject of the table. Profiles (DP, NP, CP, and S0201) cover multiple topics, so they do not have any characters to indicate a subject.

Subject Number	Subject Name	Subject Number	Subject Name
01	Age; Sex	17	Poverty Status
02	Race	18	Disability Status
03	Hispanic or Latino Origin	19	Income
04	Ancestry	20	Earnings
05	Citizenship Status; Year of Entry; Foreign Born Place of Birth	21	Veteran Status; Period of Military Service
06	Place of Birth	22	Food Stamps/Supplemental Nutrition Assistance Program (SNAP)
07	Migration/Residence 1 Year Ago	23	Employment Status; Work Status Last Year
08	Commuting (Journey to Work); Place of Work	24	Industry, Occupation, and Class of Worker
09	Relationship to Householder	25	Housing Characteristics
10	Grandparents and Grandchildren Characteristics	26	Group Quarters
11	Household Type; Family Type; Subfamilies	27	Health Insurance Coverage
12	Marital Status; Marital History	28	Computer and Internet Use
13	Fertility	29	Citizen Voting-Age Population
14	School Enrollment	98	Quality Measures
15	Educational Attainment; Undergraduate Field of Degree	99	Allocation Table for Any Subject
16	Language Spoken at Home

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For selected tables, an alphabetic suffix follows to indicate that a table is repeated for the nine major race and Hispanic or Latino groups:

Code	Race or Ethnic Group
A	White Alone
B	Black or African American Alone
C	American Indian and Alaska Native Alone
D	Asian Alone
E	Native Hawaiian and Other Pacific Islander Alone
F	Some Other Race Alone
G	Two or More Races
H	White Alone, Not Hispanic or Latino
I	Hispanic or Latino

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For selected tables, a final alphabetic suffix "PR" follows to indicate a table is available for Puerto Rico geographies only. These Puerto Rico-specific tables exist because for some geography-based subjects, the wording of the Puerto Rico Community Survey questionnaire differs slightly but significantly from the American Community Survey questionnaire. (For example, the ACS asks "When did this person come to live in the United States?" whereas the PRCS asks "When did this person come to live in Puerto Rico?") The comparable United States table has the same ID but without the trailing "PR" (e.g., B06004A and B06004APR).

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