Is being in an area of Idaho that’s growing quickly a good thing or a bad thing?
Depends on who you ask.
Some want bigger, more exciting cities like Boise City and Meridian, while others want peace and quiet like in Rigby and Preston, thank you very much.
But today, we’re going to put opinions aside and look at the cold, hard facts — since 2010, which cities in Idaho have grown the fastest.
After getting knee-deep in the Census’s American Community Survey using Saturday Night Science, we emerged with this set of cities in the Gem State that have people climbing over each other to get in.
Table Of Contents: Top Ten | Methodology | Summary | Table
What’s the fastest growing city in Idaho for 2025? Based on the most recent ACS data, Star ranks as the fastest-growing city in Idaho. If you happen to be a resident of Star, you’re probably not surprised to find it on our list.
If you’re surprised — and you’re wondering why these places are a big deal — keep reading. We’ll tell you what makes each of these 10 places in Idaho grow like weeds.
For more Idaho state reading:
- Best Places To Live In The United States
- Fastest Growing States In The United States
- Best Places To Live In Idaho
- Cheapest Places To Live In Idaho
- Most Dangerous Cities In Idaho
The 10 Fastest Growing Cities In Idaho For 2025
1. Star
/10
Population: 13,231
Population 2010: 5,173
Percent Growth 155.8%
Absolute Growth: 8,058
More on Star: Data
2. Middleton
/10
Population: 10,101
Population 2010: 5,203
Percent Growth 94.1%
Absolute Growth: 4,898
More on Middleton: Data
3. Kuna
/10
Population: 25,960
Population 2010: 13,764
Percent Growth 88.6%
Absolute Growth: 12,196
More on Kuna: Data
4. Meridian
/10
Population: 124,865
Population 2010: 68,953
Percent Growth 81.1%
Absolute Growth: 55,912
More on Meridian: Data
5. Eagle
/10
Population: 31,490
Population 2010: 18,752
Percent Growth 67.9%
Absolute Growth: 12,738
More on Eagle: Data
6. Rexburg
/10
Population: 39,589
Population 2010: 24,513
Percent Growth 61.5%
Absolute Growth: 15,076
More on Rexburg: Data
7. Post Falls
/10
Population: 41,716
Population 2010: 26,179
Percent Growth 59.3%
Absolute Growth: 15,537
More on Post Falls:
8. Rathdrum
/10
Population: 10,133
Population 2010: 6,545
Percent Growth 54.8%
Absolute Growth: 3,588
More on Rathdrum:
9. Ammon
/10
Population: 18,496
Population 2010: 12,443
Percent Growth 48.6%
Absolute Growth: 6,053
More on Ammon: Data
10. Caldwell
/10
Population: 63,465
Population 2010: 43,749
Percent Growth 45.1%
Absolute Growth: 19,716
More on Caldwell: Data
Methodology: How We Measured The Fastest Growing Cities In the Gem State for 2025
To figure out which cities are growing the most, we used Saturday Night Science to look at the growth rates for cities since the beginning of the decade, according to the American Community Survey put out by the census every year. Specifically:
- Current Population
- Population in 2010
- Growth rate from 2010 to Current (The latest available data which came out in Dec 2023)
We ranked all 34 Idaho cities with a population over 5,000 people from highest growth rate to lowest.
The city with the highest growth rate during this time was crowned the fastest-growing city in the Gem State.
And for those of you who are a little rusty with their statistics, you can calculate the growth rate by the following formula:
[Current Population – Population 2010] / [Population 2010]
The data has been updated for 2025. This report is our tenth time ranking the fastest growing cities in Idaho.
Here’s a graph of the cities in Idaho with the most significant percent increase in population:
Summary: These Places Grew Up So Fast In Idaho, You Know?
So there you have it, the fastest growing cities in Idaho are led by Star which has been growing at a blistering pace this decade relative to other cities and towns around the state.
The fastest-growing cities in Idaho are Star, Middleton, Kuna, Meridian, Eagle, Rexburg, Post Falls, Rathdrum, Ammon, and Caldwell.
It’ll be interesting to see if these places can keep growing at the same rate over the next couple of years. We’ll be here to let you know!
These places have been growing (or shrinking) the slowest (fastest):
- Weiser
- Pocatello
- Lewiston
For more Idaho reading, check out:
Fastest Growing Places In Idaho For 2025
| Rank | City | Population | Population 2010 | Growth | Absolute Growth |
|---|---|---|---|---|---|
| 1 | Star | 13,231 | 5,173 | 155.8% | 8,058 |
| 2 | Middleton | 10,101 | 5,203 | 94.1% | 4,898 |
| 3 | Kuna | 25,960 | 13,764 | 88.6% | 12,196 |
| 4 | Meridian | 124,865 | 68,953 | 81.1% | 55,912 |
| 5 | Eagle | 31,490 | 18,752 | 67.9% | 12,738 |
| 6 | Rexburg | 39,589 | 24,513 | 61.5% | 15,076 |
| 7 | Post Falls | 41,716 | 26,179 | 59.3% | 15,537 |
| 8 | Rathdrum | 10,133 | 6,545 | 54.8% | 3,588 |
| 9 | Ammon | 18,496 | 12,443 | 48.6% | 6,053 |
| 10 | Caldwell | 63,465 | 43,749 | 45.1% | 19,716 |