Where do Williamson County's new residents come from? (DRAFT – not published)

In short

• The county added about 23,800 people in the year to July 2025, down from about 29,200 in the year to July 2021.¹
• Most growth still comes from people moving in from other U.S. places, but that number fell from about 26,700 to about 14,800 a year.¹
• Births rose from about 7,100 to about 8,500 a year. Births now outnumber deaths by more than 2 to 1.¹²

Numbers marked “our math” are our estimates, not official figures. The notes show the inputs and the steps.

How it works

• Each year the Census Bureau estimates how a county changed from one July 1 to the next.¹
• It splits the change into parts: births minus deaths, people moving from other countries, and people moving from other U.S. places.¹
• These are estimates. A small leftover amount does not fit any part.¹

What the numbers show

Year ending July 1	Total change	Births	Deaths	Moved from other countries	Moved from other U.S. places
2021	+29,179	7,137	3,869	754	26,658
2022	+29,688	8,065	4,049	4,194	20,188
2023	+27,320	8,179	3,926	5,250	17,467
2024	+27,215	8,464	3,924	7,751	14,763
2025	+23,814	8,503	3,951	4,618	14,764

Source: U.S. Census Bureau, 2025 county population estimates.¹

• Moves from other U.S. places fell about 45% from 2021 to 2025 (our math).¹²
• Births minus deaths added about 4,600 people in 2025, up from about 3,300 in 2021.¹
• The county had about 752,800 people in July 2025. See county population growth.¹

The other side

• Slower is still fast. The county still grew about 3% in the last year, far faster than Texas as a whole (about 1.2%, our math).¹²
• One year can be unusual. These estimates do not say why moves went up or down in any year, so a single starting year can make a change look larger or smaller.
• Estimates get revised. Each new release can change these numbers.¹

Changes to this page

• Nov. 2, 2026: We changed wording so it says no more than our sources show.
• Nov. 2, 2026: Rewrote the questions to ask so each is open, neutral and addressed to the public body.
• Nov. 2, 2026: We checked every figure against its source. We reworded the other-side points so they stick to what the sources show.

Questions to ask

• How do county plans for roads, courts and jail space account for changes in the pace of moves?
• Which parts of the county are getting most new residents, by the county’s data?

What we still don’t know

• Why fewer people moved in. The estimates show how many, not why.
• Where in the county new residents settled. This page uses county totals only.

Footnotes

1. U.S. Census Bureau, Vintage 2025 county population estimates (CO-EST2025-ALLDATA), Williamson County and Texas: yearly population change, births, deaths, international migration and domestic migration, 2021–2025. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/totals/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹²

2. Our math. Domestic moves (14,764 − 26,658) ÷ 26,658 = −44.6%. Births to deaths 2025: 8,503 ÷ 3,951 = 2.2. Growth 2025: 23,814 ÷ 729,013 = 3.3%; Texas 391,243 ÷ 31,318,578 = 1.2%. ↩ ↩² ↩³