The 10 Fastest Growing Cities In Colorado For 2021

We used data and science to determine the places in Colorado everyone wants to move to today.

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Editor’s Note: Data has been updated for 2021. This is our seventh time ranking the fastest growing cities in Colorado.

Is being in an area that's growing quickly a good thing or a bad thing?

Depends on who you ask. Some want bigger, more exciting cities like Denver and Colorado Springs, while others want peace and quiet like in Glendale and Manitou Springs, thank you very much.

But today we're going to put opinions aside and just look at the cold hard facts -- over the past five years, which cities in Colorado have the grown the fastest.

After getting knee deep in the Census's American Community Survey, we emerged with this set of cities in the Centennial State that have people climbing over each other to get in.

These are the 10 fastest growing cities in Colorado for 2021 according to the most recent census data:

The 10 Fastest Growing Cities In Colorado For 2021

  1. John
  2. Frederick
  3. Wellington
  4. Firestone
  5. Windsor
  6. Monument
  7. Erie
  8. Lochbuie
  9. Castle Rock
  10. Berthoud

What's the fastest growing city in Colorado for 2021? Based on the most recent ACS data, John ranks as the fastest growing city in Colorado. If you happen to be a resident of John, you're probably not too surprised to find it on our list.

If you're surprised--and you're wondering why these places are kind of a big deal--keep reading. We'll tell you what makes each of these 10 places in Colorado are growing like weeds.

And if you already knew these places were happening, check out the best places to live in Colorado or the Fastest Growing States In America.

For more Colorado state reading:

The 10 Fastest Growing Cities In Colorado For 2021

1. John

Source: Public Domain
Overall SnackAbility


Population: 14,910
Rank Last Year: 1 (No Change)
Population 2010: 8,656
Percent Growth 72.3%
Absolute Growth: 6,254
More on John: Homes For Sale | Data

2. Frederick

Frederick, CO

Overall SnackAbility


Population: 12,767
Rank Last Year: 2 (No Change)
Population 2010: 7,710
Percent Growth 65.6%
Absolute Growth: 5,057
More on Frederick: Homes For Sale | Data | Photos

3. Wellington

Wellington, CO

Overall SnackAbility


Population: 9,272
Rank Last Year: 3 (No Change)
Population 2010: 5,648
Percent Growth 64.2%
Absolute Growth: 3,624
More on Wellington: Homes For Sale | Data | Photos

4. Firestone

Firestone, CO

Overall SnackAbility


Population: 14,033
Rank Last Year: 4 (No Change)
Population 2010: 8,866
Percent Growth 58.3%
Absolute Growth: 5,167
More on Firestone: Homes For Sale | Data | Photos

5. Windsor

Windsor, CO

Overall SnackAbility


Population: 26,806
Rank Last Year: 5 (No Change)
Population 2010: 17,306
Percent Growth 54.9%
Absolute Growth: 9,500
More on Windsor: Homes For Sale | Data | Photos

6. Monument

Monument, CO

Overall SnackAbility


Population: 7,398
Rank Last Year: 6 (No Change)
Population 2010: 4,869
Percent Growth 51.9%
Absolute Growth: 2,529
More on Monument: Homes For Sale | Data | Photos

7. Erie

Erie, CO

Overall SnackAbility


Population: 24,223
Rank Last Year: 8 (Up 1)
Population 2010: 16,134
Percent Growth 50.1%
Absolute Growth: 8,089
More on Erie: Homes For Sale | Data | Photos

8. Lochbuie

Lochbuie, CO

Overall SnackAbility


Population: 6,388
Rank Last Year: 9 (Up 1)
Population 2010: 4,306
Percent Growth 48.4%
Absolute Growth: 2,082
More on Lochbuie: Homes For Sale | Data | Photos

9. Castle Rock

Castle Rock, CO

Overall SnackAbility


Population: 62,417
Rank Last Year: 10 (Up 1)
Population 2010: 44,402
Percent Growth 40.6%
Absolute Growth: 18,015
More on Castle Rock: Homes For Sale | Data | Photos

10. Berthoud

Berthoud, CO

Overall SnackAbility


Population: 7,191
Rank Last Year: 14 (Up 4)
Population 2010: 5,143
Percent Growth 39.8%
Absolute Growth: 2,048
More on Berthoud: Homes For Sale | Data | Photos

How We Measured The Fastest Growing Cities In the Centennial State for 2021

To figure out which cities are growing the most, we simply had to look at the growth rates for cities sine 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 2018)

We ranked all 78 Colorado 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 Centennial 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]

Here's a graph of the cities in Colorado with the largest percent increase in population:
Fastest Growing Cities in Colorado Graph For 2021

Click to enlarge

These Places Grew Up So Fast In Colorado, You Know?

So there you have it, the fastest growing cities in Colorado are led by John which has been growing at a blistering pace this decade relative to other cities and towns around the state.

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):

  1. Trinidad
  2. Lamar
  3. Craig

For more Colorado reading, check out:

Detailed List Of Fastest Growing Places In Colorado For 2021

Rank City Growth Population Population 2010
1 John 72.3% 14,910 8,656
2 Frederick 65.6% 12,767 7,710
3 Wellington 64.2% 9,272 5,648
4 Firestone 58.3% 14,033 8,866
5 Windsor 54.9% 26,806 17,306
6 Monument 51.9% 7,398 4,869
7 Erie 50.1% 24,223 16,134
8 Lochbuie 48.4% 6,388 4,306
9 Castle Rock 40.6% 62,417 44,402
10 Berthoud 39.8% 7,191 5,143

How Is The Area In ?

About Chris Kolmar

Chris Kolmar has been in the real estate business for almost ten years now. He originally worked for Movoto Real Estate as the director of marketing before founding HomeSnacks.

He believes the key to finding the right place to live comes down to looking at the data, reading about things to do, and, most importantly, checking it out yourself before you move.

If you've been looking for a place to live in the past several years, you've probably stumbled upon his writing already.

You can find out more about him on LinkedIn or his website.