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Mapped: A Decade of Population Growth and Decline in U.S. Counties

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map showing changes in population in the us from 2010 to 2020

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A Decade of Population Growth and Decline in U.S. Counties

There are a number of factors that determine how much a region’s population changes.

If an area sees a high number of migrants, along with a strong birth rate and low death rate, then its population is bound to increase over time. On the flip side, if more people are leaving the area than coming in, and the region’s birth rate is low, then its population will likely decline.

Which areas in the United States are seeing the most growth, and which places are seeing their populations dwindle?

This map, using data from the U.S. Census Bureau, shows a decade of population movement across U.S. counties, painting a detailed picture of U.S. population growth between 2010 and 2020.

Counties With The Biggest Population Growth from 2010-2020

To calculate population estimates for each county, the U.S. Census Bureau does the following calculations:

A county’s base population → plus births → minus deaths → plus migration = new population estimate

 
From 2010 to 2020, Maricopa County in Arizona saw the highest increase in its population estimate. Over a decade, the county gained 753,898 residents. Below are the counties that saw the biggest increases in population:

RankCountyPoint of ReferenceStatePop. Growth (2010–2020)
#1Maricopa CountyPhoenix, ScottsdaleArizona+753,898
#2Harris CountyHoustonTexas+630,711
#3Clark CountyLas VegasNevada+363,323
#4King CountySeattleWashington+335,884
#5Tarrant CountyFort Worth, ArlingtonTexas+305,180
#6Bexar CountySan AntonioTexas+303,982
#7Riverside CountyRiverside, Palm SpringsCalifornia+287,626
#8Collin CountyPlanoTexas+284,967
#9Travis CountyAustinTexas+270,111
#10Hillsborough CountyTampaFlorida+264,446

Phoenix and surrounding areas grew faster than any other major city in the country. The region’s sunny climate and amenities are popular with retirees, but another draw is housing affordability. Families from more expensive markets—California in particular—are moving to the city in droves. This is a trend that spilled over into the pandemic era as more people moved into remote and hybrid work situations.

Texas counties saw a lot of growth as well, with five of the top 10 gainers located in the state of Texas. A big draw for Texas is its relatively affordable housing market. In 2021, average home prices in the state stood at $172,500$53,310 below the national average.

Counties With The Biggest Population Drops from 2010-2020

On the opposite end of the spectrum, here’s a look at the top 10 counties that saw the biggest declines in their populations over the decade:

RankCountyPoint of ReferenceStatePop. Growth (2010–2020)
#1Cook CountyChicagoIllinois-90,693
#2Wayne CountyDetroitMichigan-74,224
#3Cuyahoga CountyClevelandOhio-50,220
#4Genesee CountyFlintMichigan-20,165
#5Suffolk CountyLong IslandNew York-20,064
#6Caddo ParishShreveportLouisiana-18,173
#7Westmoreland CountyMurrysvillePennsylvania-17,942
#8Hinds CountyJacksonMississippi-17,751
#9Kanawha CountyCharlestonWest Virginia-16,672
#10Cambria CountyJohnstownPennsylvania-14,786

The largest drops happened in counties along the Great Lakes, including Cook County (which includes the city of Chicago) and Wayne County (which includes the city of Detroit).

For many of these counties, particularly those in America’s “Rust Belt”, population drops over this period were a continuation of decades-long trends. Wayne County is an extreme example of this trend. From 1970 to 2020, the area lost one-third of its population.

U.S. Population Growth in Percentage Terms (2010-2020)

While the map above is great at showing where the greatest number of Americans migrated, it downplays big changes in counties with smaller populations.

For example, McKenzie County in North Dakota, with a 2020 population of just 15,242, was the fastest-growing U.S. county over the past decade. The county’s 138% increase was driven primarily by the Bakken oil boom in the area. High-growth counties in Texas also grew as new sources of energy were extracted in rural areas.

The nation’s counties are evenly divided between population increase and decline, and clear patterns emerge.

population changes in u.s. counties (%)

Pandemic Population Changes

More recent population changes reflect longer-term trends. During the COVID-19 pandemic, many of the counties that saw the strongest population increases were located in high-growth states like Florida and Texas.

Below are the 20 counties that grew the most from 2020 to 2021.

RankCountyPoint of ReferenceStatePop. Growth (2020–2021)
#1Maricopa CountyPhoenixArizona+58,246
#2Collin CountyPlanoTexas+36,313
#3Riverside CountyRiverside, Palm SpringsCalifornia+35,631
#4Fort Bend CountySugar LandTexas+29,895
#5Williamson CountyGeorgetownTexas+27,760
#6Denton CountyDentonTexas+27,747
#7Polk CountyLakelandFlorida+24,287
#8Montgomery CountyThe WoodlandsTexas+23,948
#9Lee CountyFort MyersFlorida+23,297
#10Utah CountyProvoUtah+21,843
#11Pinal CountySan Tan ValleyArizona+19,974
#12Clark CountyLas VegasNevada+19,090
#13Pasco CountyNew Port RicheyFlorida+18,322
#14Wake CountyRaleighNorth Carolina+16,651
#15St. Johns CountySt. AugustineFlorida+15,550
#16Hillsborough CountyTampaFlorida+14,814
#17Bexar CountySan AntonioTexas+14,184
#18Ada CountyBoiseIdaho+13,947
#19Osceola CountyKissimmeeFlorida+12,427
#20St. Lucie CountyFort PierceFlorida+12,304

Many of these counties are located next to large cities, reflecting a shift to the suburbs and larger living spaces. However, as COVID-19 restrictions ease, and the pandemic housing boom tapers off due to rising interest rates, it remains to be seen whether the suburban shift will continue, or if people begin to migrate back to city centers.

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Charted: The World’s Biggest Oil Producers

Just three countries—the U.S., Saudi Arabia and Russia—make up the lion’s share of global oil supply. Here are the biggest oil producers in 2022.

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A cropped chart with the per day production by the biggest oil producers in 2022.

Charted: The World’s Biggest Oil Producers in 2022

In 2022 oil prices peaked at more than $100 per barrel, hitting an eight-year high, after a full year of turmoil in the energy markets in the wake of the Russian invasion of Ukraine.

Oil companies doubled their profits and the economies of the biggest oil producers in the world got a major boost.

But which countries are responsible for most of the world’s oil supply? Using data from the Statistical Review of World Energy by the Energy Institute, we’ve visualized and ranked the world’s biggest oil producers.

Ranked: Oil Production By Country, in 2022

The U.S. has been the world’s biggest oil producer since 2018 and continued its dominance in 2022 by producing close to 18 million barrels per day (B/D). This accounted for nearly one-fifth of the world’s oil supply.

Almost three-fourths of the country’s oil production is centered around five states: Texas, New Mexico, North Dakota, Alaska, and Colorado.

We rank the other major oil producers in the world below.

RankCountry2022 Production
(Thousand B/D)
YoY ChangeShare of
World Supply
1🇺🇸 U.S.17,770+6.5%18.9%
2🇸🇦 Saudi Arabia12,136+10.8%12.9%
3🇷🇺 Russia11,202+1.8%11.9%
4🇨🇦 Canada5,576+3.0%5.9%
5🇮🇶 Iraq4,520+10.2%4.8%
6🇨🇳 China4,111+2.9%4.4%
7🇦🇪 UAE4,020+10.4%4.3%
8🇮🇷 Iran3,822+4.6%4.1%
9🇧🇷 Brazil3,107+3.9%3.3%
10🇰🇼 Kuwait3,028+12.0%3.2%
11🇲🇽 Mexico1,944+0.9%2.1%
12🇳🇴 Norway1,901-6.3%2.0%
13🇰🇿 Kazakhstan1,769-2.0%1.9%
14🇶🇦 Qatar1,768+1.8%1.9%
15🇩🇿 Algeria1,474+8.9%1.6%
16🇳🇬 Nigeria1,450-11.2%1.5%
17🇦🇴 Angola1,190+1.1%1.3%
18🇱🇾 Libya1,088-14.3%1.2%
19🇴🇲 Oman1,064+9.6%1.1%
20🇬🇧 UK778-11.0%0.8%
21🇨🇴 Colombia754+2.4%0.8%
22🇮🇳 India737-3.8%0.8%
23🇻🇪 Venezuela731+8.1%0.8%
24🇦🇷 Argentina706+12.4%0.8%
25🇦🇿 Azerbaijan685-5.6%0.7%
26🇮🇩 Indonesia644-6.9%0.7%
27🇪🇬 Egypt613+0.8%0.7%
28🇲🇾 Malaysia567-1.7%0.6%
29🇪🇨 Ecuador481+1.7%0.5%
30🇦🇺 Australia420-5.2%0.4%
31🇹🇭 Thailand331-17.5%0.4%
32🇨🇩 Congo269-1.7%0.3%
33🇹🇲 Turkmenistan244+1.0%0.3%
34🇻🇳 Vietnam194-1.2%0.2%
35🇬🇦 Gabon191+5.4%0.2%
36🇸🇸 South Sudan141-7.6%0.2%
37🇵🇪 Peru128+0.5%0.1%
38🇹🇩 Chad124+6.2%0.1%
39🇬🇶 Equatorial
Guinea
119-9.2%0.1%
40🇸🇾 Syria93-2.7%0.1%
41🇮🇹 Italy92-7.9%0.1%
42🇧🇳 Brunei92-13.8%0.1%
43🇾🇪 Yemen81-2.4%0.1%
44🇹🇹 Trinidad
& Tobago
74-3.6%0.1%
45🇷🇴 Romania65-6.2%0.1%
46🇩🇰 Denmark65-1.6%0.1%
47🇺🇿 Uzbekistan63-0.9%0.1%
48🇸🇩 Sudan62-3.3%0.1%
49🇹🇳 Tunisia40-12.9%0.0%
50Other CIS43+4.4%0.0%
51Other Middle East210+1.2%0.2%
52Other Africa283-3.4%0.3%
53Other Europe230-20.5%0.2%
54Other Asia Pacific177-10.6%0.2%
55Other S. &
Cent. America
381+68.5%0.4%
Total World93,848+4.2%100.0%

Behind America’s considerable lead in oil production, Saudi Arabia (ranked 2nd) produced 12 million B/D, accounting for about 13% of global supply.

Russia came in third with 11 million B/D in 2022. Together, these top three oil producing behemoths, along with Canada (4th) and Iraq (5th), make up more than half of the entire world’s oil supply.

Meanwhile, the top 10 oil producers, including those ranked 6th to 10th—China, UAE, Iran, Brazil, and Kuwait—are responsible for more than 70% of the world’s oil production.

Notably, all top 10 oil giants increased their production between 2021–2022, and as a result, global output rose 4.2% year-on-year.

Major Oil Producing Regions in 2022

The Middle East accounts for one-third of global oil production and North America makes up almost another one-third of production. The Commonwealth of Independent States—an organization of post-Soviet Union countries—is another major regional producer of oil, with a 15% share of world production.

Region2022 Production
(Thousand B/D)
YoY ChangeShare of
World Supply
Middle East30,743+9.2%32.8%
North America25,290+5.3%27.0%
CIS14,006+0.9%14.9%
Africa7,043-3.5%7.5%
Asia Pacific7,273-1.4%7.8%
South & Central
America
6,3617.2%6.8%
Europe3,131-8.6%3.3%

What’s starkly apparent in the data however is Europe’s declining share of oil production, now at 3% of the world’s supply. In the last 20 years the EU’s oil output has dropped by more than 50% due to a variety of factors, including stricter environmental regulations and a shift to natural gas.

Another lens to look at regional production is through OPEC members, which control about 35% of the world’s oil output and about 70% of the world’s oil reserves.

A pictogram of the regional per day production by the biggest oil producers in 2022.

When taking into account the group of 10 oil exporting countries OPEC has relationships with, known as OPEC+, the share of oil production increases to more than half of the world’s supply.

Oil’s Big Balancing Act

Since it’s the very lifeblood of the modern economy, the countries that control significant amounts of oil production also reap immense political and economic benefits. Entire regions have been catapulted into prosperity and wars have been fought over the control of the resource.

At the same time, the ongoing effort to pivot to renewable energy is pushing many major oil exporters to diversify their economies. A notable example is Saudi Arabia, whose sovereign wealth fund has invested in companies like Uber and WeWork.

However, the world still needs oil, as it supplies nearly one-third of global energy demand.

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