U.S. Population Growth by State: 2020–2025 Trends, Rankings, and Key Drivers

Between April 1, 2020, and July 1, 2025, the United States added more than 10 million residents, according to the U.S. Census Bureau’s Vintage 2025 state population estimates. The growth was far from evenly distributed: nearly three-quarters of the national increase occurred in the South, and a handful of states—led by Idaho, Florida, and South Carolina—accounted for an outsized share of the gains. These state-level shifts reflect a combination of domestic migration, international immigration, and natural change, and they carry major consequences for congressional representation, federal funding, and regional economies.

Key Numbers

• Total U.S. population growth, 2020–2025: more than 10 million people
• Share of U.S. growth in the South: nearly three-quarters
• Fastest-growing state, 2020–2025: Idaho, up 10.4%
• Second-fastest state: Florida, up 8.9%
• Third-fastest state: South Carolina, up 8.8%
• Average one-year state population change, 2023–2024: 1.55%
• Florida one-year growth, 2023–2024: 3.37% (from 22.61 million to 23.27 million)
• Southern states’ combined growth: more than all other regions combined

Explanation

State population growth measures the change in the number of people living in a state over a specific period. The Census Bureau produces annual estimates by starting with the most recent decennial census count and adding births, subtracting deaths, and accounting for net domestic migration (people moving between states) and net international migration. The result is the resident population as of July 1 each year.

The 2020–2025 period has been shaped by the COVID-19 pandemic and its aftermath. Remote work expanded dramatically, allowing many households to leave high-cost coastal metros for lower-cost, lower-tax states in the South and Mountain West. At the same time, international migration rebounded after pandemic-era restrictions, and natural increase (births minus deaths) remained low by historical standards. These forces combined to produce a clear regional pattern: the South added more residents than all other regions combined, while some large states in the Northeast and Midwest grew slowly or lost population.

The state-level rankings highlight the unevenness. Idaho’s 10.4% growth rate was more than triple the national average, driven by strong in-migration from California and other Western states. Florida and South Carolina followed at 8.9% and 8.8%, respectively, reflecting sustained retirement migration, job growth, and relative affordability. Texas also continued to add large numbers of residents, reinforcing the South’s dominance.

Definition

Population growth by state refers to the net change in a state’s resident population over a given period, usually expressed as a numeric increase or decrease and as a percentage change. The U.S. Census Bureau defines the resident population as all people whose usual place of residence is in the state, including military personnel stationed in the state and excluding U.S. citizens living abroad. Growth can be positive or negative and is driven by four components: births, deaths, net domestic migration, and net international migration.

For the Vintage 2025 estimates, the reference period is April 1, 2020 (Census Day) to July 1, 2025. The percentage change is calculated by dividing the numeric change by the population at the beginning of the period and multiplying by 100. For example, a state that grew from 1,000,000 to 1,104,000 residents over five years would have a 10.4% growth rate.

Historical Data

The Census Bureau’s Vintage 2025 release provides annual population estimates for each state from April 1, 2020, to July 1, 2025. These estimates are updated each year to incorporate new data on births, deaths, and migration. The 2020–2025 period follows a decade in which the South and West generally grew faster than the Northeast and Midwest, a pattern that has persisted and intensified in the early 2020s.

While the available summary data do not include year-by-year figures for every state, the cumulative five-year change shows a clear hierarchy. The following table lists the three fastest-growing states by percentage change from 2020 to 2025, based on the Visual Capitalist analysis of Census Bureau data.

These rates compare with a national growth rate of roughly 3% over the same period, based on the total increase of more than 10 million people from a 2020 base of about 331 million. The gap between the fastest-growing states and the national average underscores how concentrated recent population gains have been.

State Comparison

State population growth varies widely. At the top, Idaho, Florida, and South Carolina each grew by roughly 9% to 10% over five years. At the other end, several large states in the Northeast, Midwest, and West have seen much slower growth or outright declines. California, the nation’s most populous state, has experienced sluggish growth during this period, reflecting high housing costs, domestic out-migration, and a slower post-pandemic recovery in some metro areas.

The contrast between fast-growing and slow-growing states is not just about percentage rates; it also reflects absolute numbers. Florida added more than 650,000 residents in a single year (2023–2024), while smaller states with high percentage growth, such as Idaho, added far fewer people in absolute terms. Both measures matter: percentage change shows momentum, while numeric change shows where the most people are actually moving.

• Idaho: 10.4% growth, driven by in-migration from Western states.
• Florida: 8.9% growth and the largest numeric gains among the top three.
• South Carolina: 8.8% growth, reflecting retirement and job-related moves.
• California: much slower growth or decline, with net domestic out-migration.

National Comparison

Nationally, the U.S. population grew by more than 10 million people between 2020 and 2025. The South’s share of that growth—nearly three-quarters—means that the region added more residents than the Northeast, Midwest, and West combined. This is a striking concentration: the South accounts for about 38% of the U.S. population but captured roughly 75% of the growth.

Southern states added more residents than all other regions combined, with Florida and Texas among the biggest beneficiaries.

The national average one-year change for all states was 1.55% between 2023 and 2024, according to SmartAsset’s analysis of Census Bureau data. Florida’s one-year growth of 3.37% was more than double that average, while some states likely posted declines. The most recent one-year period (July 1, 2024, to July 1, 2025) is covered by the Census Bureau’s state population percentage change map, which shows continued regional divergence.

Ranking Table

The table below ranks the three states with the highest five-year population growth rates from 2020 to 2025, based on the available summary data. Additional state-level rankings are available in the Census Bureau’s NST-EST2025-POP and NST-EST2025-CHG tables.

Because the available summary data highlight only the top three states, the full ranking of all 50 states and the District of Columbia should be consulted directly from the Census Bureau. However, the pattern is clear: the fastest growth is concentrated in the South and Mountain West, while many Northeastern and Midwestern states rank near the bottom.

Year-over-Year Change

Year-over-year changes can be more volatile than five-year trends because they capture short-term migration shocks, policy changes, and economic cycles. For the period from July 1, 2023, to July 1, 2024, the average state population change was 1.55%, according to SmartAsset. Florida led with a 3.37% increase, adding about 660,000 residents and pushing its population from 22.61 million to 23.27 million.

The Census Bureau’s most recent one-year map covers July 1, 2024, to July 1, 2025, and shows the percentage change for each state. While the specific percentages are not included in the summary text, the map reinforces the same regional pattern: darker shades in the South and Mountain West, lighter shades or declines in parts of the Northeast, Midwest, and West Coast.

• 2023–2024 average state change: 1.55%
• Florida 2023–2024 change: 3.37%
• Florida numeric gain: approximately 660,000 people
• Most recent period: July 1, 2024–July 1, 2025 (Census map)

Map

The Census Bureau’s Percent Change in State Population: July 1, 2024 to July 1, 2025 map uses a color gradient to show how each state’s population changed over the most recent one-year period. States with the highest growth rates are shaded in darker colors, while states with declines are shown in a contrasting color. The map is a quick visual tool for identifying regional clusters of growth and decline.

Although the map itself cannot be rendered here, the key takeaways are consistent with the five-year data: the South and Mountain West appear as the darkest regions, indicating the strongest growth, while parts of the Northeast and Midwest show lighter shades or negative values. The map also highlights that even within fast-growing regions, there is variation—some Southern states grew faster than others, and some Western states outside the Mountain division grew more slowly.

Methodology

The U.S. Census Bureau produces state population estimates using a component-of-change method. The process begins with the April 1, 2020 decennial census count for each state. For each subsequent year, the Bureau adds estimated births, subtracts estimated deaths, adds net international migration, and adds net domestic migration (the difference between people moving into the state from other states and people moving out). The estimates are updated annually and labeled by vintage, with Vintage 2025 being the most recent completed set.

The estimates rely on administrative records, including birth and death certificates from the National Center for Health Statistics, tax return data from the IRS for domestic migration, and immigration statistics from the Department of Homeland Security and other sources. Because these are estimates rather than full counts, they are subject to revision as new data become available. The Census Bureau also publishes components-of-change tables that break down each state’s growth into natural increase, net domestic migration, and net international migration.

Why It Matters

State population growth directly affects political representation and federal funding. The decennial census determines how many seats each state gets in the U.S. House of Representatives, and the annual population estimates are used to allocate hundreds of billions of dollars in federal funds each year. States that grow faster than the national average may gain political influence, while slow-growing or shrinking states may lose seats and funding.

Population growth also shapes state and local economies. Fast-growing states face rising demand for housing, schools, roads, and public services, which can strain infrastructure but also create jobs and expand tax bases. Slow-growing states may struggle with labor shortages, aging populations, and declining revenues. Understanding these trends helps policymakers, businesses, and households plan for the future.

Factors Behind the Trend

Several factors explain the state-level population shifts from 2020 to 2025. The rise of remote work during and after the COVID-19 pandemic allowed many workers to move away from expensive coastal cities without changing jobs. Florida and Texas, in particular, benefited from their favorable tax climates—neither has a state income tax—and warmer weather. Idaho and other Mountain West states attracted people seeking outdoor amenities and lower housing costs relative to California and the Pacific Northwest.

International migration also played a role, especially in states with large immigrant gateways such as Florida and Texas. Natural increase—births minus deaths—remained low nationally, meaning that domestic migration was the primary driver of divergence between fast- and slow-growing states. States with high housing costs, such as California and New York, tended to lose more residents to other states than they gained, offsetting some of their international immigration gains.

• Remote work: enabled moves to lower-cost states.
• Tax differences: no income tax in Florida and Texas attracted high earners.
• Climate and amenities: Sun Belt and Mountain West appeal.
• Housing costs: high-cost states saw net domestic out-migration.
• International migration: boosted gateway states.

Limitations of the Data

State population estimates are not exact counts. They are based on administrative records and statistical models, and they are revised each year as more complete data become available. The Vintage 2025 estimates may change in future vintages, particularly for components like domestic migration, which is difficult to measure precisely. Small states and small population changes can have larger relative errors.

Another limitation is that the available summary data in this article highlight only the top three states by five-year growth and a few one-year figures. A full analysis of all 50 states requires consulting the Census Bureau’s detailed tables. Additionally, percentage change can be misleading for very small states, where a modest numeric gain produces a large percentage increase. Readers should consider both percentage and numeric change when comparing states.

Largest States

Population growth rates are often most consequential when they occur in the nation’s largest states. California remains the most populous state, followed by Texas and Florida. Florida’s population reached 23.27 million in 2024, according to SmartAsset, making it the third-largest state. Texas, the second-largest, has also been a major destination for domestic and international migrants, though its exact five-year growth rate is not included in the available summary data.

The large populations of California, Texas, and Florida mean that even modest percentage changes translate into hundreds of thousands of people. For example, Florida’s 3.37% one-year growth added about 660,000 residents—more than the entire population of several smaller states. This scale helps explain why the South’s numeric growth dominates national totals even when some smaller Western states have higher percentage growth rates.

Source & Data Date

The primary source for this article is the U.S. Census Bureau’s Vintage 2025 state population estimates, released in January 2026, covering April 1, 2020, to July 1, 2025. Specific data points are drawn from the Census Bureau’s State Population Totals and Components of Change: 2020-2025 page and the State Population Percentage Change Map published January 27, 2026. Additional context and one-year figures come from Visual Capitalist’s analysis of Census data and SmartAsset’s 2025 study of 2023–2024 population change.