**Table 1:** Comparison of total population and nativity percentages over time.
Year	Total Pop	Foreign Born	Native Born
2024	328,961	10.1%	89.9%
2023	328,317	10.0%	90.0%
2022	328,658	9.7%	90.3%
2021	328,713	9.9%	90.1%
2020	324,682	10.1%	89.9%
2019	322,510	10.7%	89.3%
2018	321,030	10.8%	89.2%
2017	316,782	10.8%	89.2%
2016	313,961	10.7%	89.3%
2015	310,032	10.7%	89.3%
2014	305,166	10.6%	89.4%
2013	301,072	10.9%	89.1%
2012	297,218	10.9%	89.1%
2011	293,205	11.2%	88.8%
2010	290,177	11.2%	88.8%

Nativity & Citizenship FAQs for Boulder County, Colorado

Approximately 10.1% of residents in Boulder County, Colorado were born outside the United States.

The vast majority of residents, roughly 95.2%, are U.S. citizens (including both native-born and naturalized citizens).

Boulder County, Colorado Nativity & Citizenship Status (2024)