The 10 Fastest Growing Cities In Maine For 2021

We used data and science to determine the places in Maine 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 Maine.

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 Portland and Lewiston, while others want peace and quiet like in Gardiner and Belfast, 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 Maine 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 Pine Tree State that have people climbing over each other to get in.

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

The 10 Fastest Growing Cities In Maine For 2021

  1. Westbrook
  2. Saco
  3. Ellsworth
  4. Waterville
  5. South Portland
  6. Portland
  7. Belfast
  8. Biddeford
  9. Auburn
  10. Lewiston

What's the fastest growing city in Maine for 2021? Based on the most recent ACS data, Westbrook ranks as the fastest growing city in Maine. If you happen to be a resident of Westbrook, 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 Maine are growing like weeds.

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

For more Maine state reading:

The 10 Fastest Growing Cities In Maine For 2021

1. Westbrook

Westbrook, ME

Overall SnackAbility


Population: 18,633
Rank Last Year: 1 (No Change)
Population 2010: 17,314
Percent Growth 7.6%
Absolute Growth: 1,319
More on Westbrook: Homes For Sale | Data | Photos

2. Saco

Saco, ME

Overall SnackAbility


Population: 19,497
Rank Last Year: 3 (Up 1)
Population 2010: 18,398
Percent Growth 6.0%
Absolute Growth: 1,099
More on Saco: Homes For Sale | Data | Photos

3. Ellsworth

Ellsworth, ME

Overall SnackAbility


Population: 7,991
Rank Last Year: 2 (Down 1)
Population 2010: 7,555
Percent Growth 5.8%
Absolute Growth: 436
More on Ellsworth: Homes For Sale | Data | Photos

4. Waterville

Waterville, ME

Overall SnackAbility


Population: 16,577
Rank Last Year: 4 (No Change)
Population 2010: 15,777
Percent Growth 5.1%
Absolute Growth: 800
More on Waterville: Homes For Sale | Data | Photos

5. South Portland

South Portland, ME

Overall SnackAbility


Population: 25,548
Rank Last Year: 5 (No Change)
Population 2010: 24,804
Percent Growth 3.0%
Absolute Growth: 744
More on South Portland: Homes For Sale | Data | Photos

6. Portland

Portland, ME

Overall SnackAbility


Population: 66,595
Rank Last Year: 6 (No Change)
Population 2010: 66,138
Percent Growth 0.7%
Absolute Growth: 457
More on Portland: Homes For Sale | Data | Photos

7. Belfast

Belfast, ME

Overall SnackAbility


Population: 6,688
Rank Last Year: 7 (No Change)
Population 2010: 6,691
Percent Growth -0.0%
Absolute Growth: -3
More on Belfast: Homes For Sale | Data | Photos

8. Biddeford

Biddeford, ME

Overall SnackAbility


Population: 21,462
Rank Last Year: 8 (No Change)
Population 2010: 21,490
Percent Growth -0.1%
Absolute Growth: -28
More on Biddeford: Homes For Sale | Data | Photos

9. Auburn

Auburn, ME

Overall SnackAbility


Population: 23,187
Rank Last Year: 9 (No Change)
Population 2010: 23,279
Percent Growth -0.4%
Absolute Growth: -92
More on Auburn: Homes For Sale | Data | Photos

10. Lewiston

Lewiston, ME

Source: Public domain
Overall SnackAbility


Population: 36,095
Rank Last Year: 10 (No Change)
Population 2010: 36,684
Percent Growth -1.6%
Absolute Growth: -589
More on Lewiston: Homes For Sale | Data | Photos

How We Measured The Fastest Growing Cities In the Pine Tree 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 19 Maine 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 Pine Tree 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 Maine with the largest percent increase in population:
Fastest Growing Cities in Maine Graph For 2021

Click to enlarge

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

So there you have it, the fastest growing cities in Maine are led by Westbrook 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. Caribou
  2. Presque Isle
  3. Old Town

For more Maine reading, check out:

Detailed List Of Fastest Growing Places In Maine For 2021

Rank City Growth Population Population 2010
1 Westbrook 7.6% 18,633 17,314
2 Saco 6.0% 19,497 18,398
3 Ellsworth 5.8% 7,991 7,555
4 Waterville 5.1% 16,577 15,777
5 South Portland 3.0% 25,548 24,804
6 Portland 0.7% 66,595 66,138
7 Belfast -0.0% 6,688 6,691
8 Biddeford -0.1% 21,462 21,490
9 Auburn -0.4% 23,187 23,279
10 Lewiston -1.6% 36,095 36,684

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.