	Housing Units		Group Quarters People
Year	Initial Addresses Selected	Final Interviews	Initial Sample Selected	Final Actual Interviews	Final Synthetic Interviews ^#
2025^†	3,215,511	1,686,000	142,622	102,000	153,000
2024	3,543,672	1,944,002	158,092	127,363	146,840
2023	3,544,357	1,978,704	152,993	129,481	144,762
2022	3,538,392	1,980,550	150,169	124,846	150,186
2021	3,538,442	1,950,832	140,036	119,144	122,876
2020^&	2,872,402	1,406,935	96,955	80,030	147,632
2019^%	3,544,301	2,059,945	167,187	150,305	128,498
2018⁺	3,544,000	2,143,000	166,000	150,000	133,000
2017^{^}	3,526,808	2,145,639	168,590	157,721	133,564
2016	3,527,047	2,229,872	206,415	160,572	131,915
2015	3,540,307	2,305,707	206,630	161,865	134,224
2014	3,540,532	2,322,722	207,403	165,116	129,913
2013^*	3,551,227	2,208,513	207,410	163,663	135,758
2012	3,539,552	2,375,715	208,551	154,182	137,086
2011	3,272,520	2,128,104	204,553	148,486	150,052
2010	2,899,676	1,917,799	197,045	144,948	N/A
2009	2,897,256	1,917,748	198,808	146,716	N/A
2008	2,894,711	1,931,955	186,862	145,974	N/A
2007	2,886,453	1,937,659	187,012	142,468	N/A
2006	2,885,384	1,968,362	189,641	145,311	N/A
2005	2,922,656	1,924,527	N/A	N/A	N/A
2004	838,293	568,966	N/A	N/A	N/A
2003	828,590	572,447	N/A	N/A	N/A
2002	742,409	512,768	N/A	N/A	N/A
2001	858,058	601,875	N/A	N/A	N/A
2000	890,698	587,519	N/A	N/A	N/A

^# Synthetic interviews were part of an effort to improve American Community Survey (ACS) estimates of the group quarters population for substate areas. Synthetic interviews were created by imputing the characteristics of interviewed group quarters persons into group quarters facilities that were not in sample that year or period. Final actual interviews are the interviews obtained from sampled group quarters residents. For more information, read the ACS Group Quarters Small Area Estimation user note.

^† The lapse in appropriations in October and November 2025 caused a suspension of ACS data collection activities and a decrease in both the sample and interview counts for 2025. For more information, see the user note. Additionally, in 2025, rounding was again used as a method to reduce disclosure risk for interview counts, replacing noise injection.

^& The effects of the pandemic on ACS activities in 2020 resulted in a lower number of addresses in sample as well as fewer interviews than a typical year. For more information, see the Analytic Report. Additionally for 2020, a small number of vacant housing unit addresses that had been originally coded as non-interviews were converted to vacant units through a modeling process in order to improve ACS estimates. These were included as interviews in these counts. For more information, see the user note.

^% In 2019, noise injection replaced rounding as our method to reduce disclosure risk for interview counts. As part of that review, we determined that the sample counts did not require protection. For more information, see User Note.

⁺ Sample and interview counts were rounded for 2018 to help reduce disclosure risk.

^{^} Hurricanes caused a disruption of data collection activities from September through December of 2017 in Puerto Rico. The sample that was affected by this interruption in data collection has been omitted from the 2017 Puerto Rico sample and interview counts. For more information, see User Note.

^* As a result of the 2013 government shutdown, the ACS did not have a second mailing, a telephone follow-up, nor a person follow-up operation for the 2013 October panel. Only respondents from the first mailing (Internet in the United States, paper questionnaire in Puerto Rico) contribute to the overall response for this panel. This caused a drop in the number of Final Interviews (housing units) for the 2013 sample year.

Sample Size

United States

Initial Addresses and Sample Selected and Final Interviews