Chicago, Illinois.
The housing market in and around Chicago is among the most vulnerable to a decline, Attom data suggests.
  • Places where homes are expensive and unemployment is high are at risk for housing-market declines.
  • Real-estate data firm Attom evaluated which counties across the country are most vulnerable.
  • Parts of Chicago, New York, and northern California are most at risk of declines. See the full list.

As the economy teeters on the brink of a recession, the country's housing markets could be in for a downturn.

A new report from Attom Data Solutions, a real-estate data provider, offers a perspective on which areas could be most vulnerable to declines — whether it's in home prices, sales activity, or other indicators of overall health. 

Existing homeowners may whinge at the thought of property values decreasing, but this data could be useful for homebuyers on a tight budget and real-estate investors who are keeping a close eye on markets that could experience further softening. While it's impossible to time the market — and it's risky to assume that prices in any one place will continue to increase — being aware of which areas are currently vulnerable may benefit anyone looking for a deal on a home.

Attom's researchers looked at a number of key indicators to determine the overall health of a region's real-estate market. The number of homes where owners owe more than they're worth, for example, indicates the prevalence of homeowners who "underwater" on their mortgage and may eventually need to sell. Such a sell-off would provide opportunistic buyers with good deals.

The report authors also looked at the number of properties currently under foreclosure, which means that lenders are currently in the process of repossessing the homes. They also looked to see if the median sale prices of a county was out of step with the percentage of the area's average income needed to pay for a home. Home prices that are out of reach for many locals suggests they are overly elevated. Last, the local unemployment rate is a sign of weak short-term economic prospects, and could mean that those out of a job, with no steady income, may need to list their home for sale.

There are a few key takeaways from the report. One is that the counties around major cities such as Chicago and New York are particularly vulnerable. The data also helps illustrate just how unaffordable homes are are in California and New York, where there are more people who are cost-burdened — or those who spend 30% or more of their take-home pay on housing. (A general rule of thumb is to spend 28% or less of your monthly income on housing costs, according to personal-finance experts.)

Out of the 581 counties Attom analyzed, here's a look at the 21 counties that are most vulnerable to a decline. They're listed in order from least to most vulnerable. 

Saint Clair County, Illinois
20030720_22_East_St._Louis,_IL_(6116695806)
Downtown East St. Louis Historic District.

Median home price: $153,000

Percent of income required to buy a house: 22.4%

Number of underwater mortgages: 8,255

Foreclosure filings: 909

Unemployment rate: 4.4%

Cook County, Illinois
Navy Pier in Chicago, Illinois
Navy Pier in Chicago, Illinois.

Median home price: $267,000

Percent of income required to buy a house: 25%

Number of underwater mortgages: 124,859

Foreclosure filings: 3,216

Unemployment rate: 4.9%

Essex County, New Jersey
Newark TopArt 675791773
An aerial view of Newark, New Jersey.

Median home price: $485,000

Percent of income required to buy a house: 48%

Number of underwater mortgages: 6,633

Foreclosure filings: 397

Unemployment rate: 3.8

Webb County, Texas
Laredo, Texas
Downtown Laredo, Texas.

Median home price: $223,000

Percent of income required to buy a house: 38%

Number of underwater mortgages: 2,529

Foreclosure filings: 97

Unemployment rate: 3.8

Kendall County, Illinois
Yorkville, Illinois.
Grain storage silos in Yorkville, Illinois.

Median home price: $285,000

Percent of income required to buy a house: 48.7%

Number of underwater mortgages: 1,842

Foreclosure filings: 72

Unemployment rate: 3.5

Sussex County, Delaware
beach homes in Sussex County Delaware
Beach homes in Sussex County, Delaware.

Median home price: $414,000

Percent of income required to buy a house: 52.1%

Number of underwater mortgages: 3,876

Foreclosure filings: 127

Unemployment rate: 4.2%

Onslow County, North Carolina
Marines sailors Camp Lejeune
Marines and sailors at Marine Corps Base Camp Lejeune in North Carolina.

Median home price: $235,000

Percent of income required to buy a house: 37.4%

Number of underwater mortgages: 2,660

Foreclosure filings: 145

Unemployment rate: 4.5%

Cumberland County, New Jersey
A church in Vineland, New Jersey.
A church in Vineland, New Jersey.

Median home price: $187,000

Percent of income required to buy a house: 28.1%

Number of underwater mortgages: 2,835

Foreclosure filings: 152

Unemployment rate: 4.3%

McHenry County, Illinois
An aerial view of Woodstock, Illinois
An aerial view of Woodstock, Illinois.

Median home price: $285,000

Percent of income required to buy a house: 44.4%

Number of underwater mortgages: 7,091

Foreclosure filings: 179

Unemployment rate: 3.4%

Charles County, Maryland
A new housing development in Waldorf, Maryland.
A new housing development in Waldorf, Maryland.

Median home price: $390,000

Percent of income required to buy a house: 49.8%

Number of underwater mortgages: 2,834

Foreclosure filings: 113

Unemployment rate: 3.5%

Cumberland County, North Carolina
Fayetteville North Carolina
The Old Town Hall in Fayetteville, North Carolina.

Median home price: $190,000

Percent of income required to buy a house: 26.1%

Number of underwater mortgages: 2,744

Foreclosure filings: 240

Unemployment rate: 5.5%

Shasta County, California
Redding California
The Sundial Bridge in Redding, California.

Median home price: $345,000

Percent of income required to buy a house: 43.5%

Number of underwater mortgages: 1,761

Foreclosure filings: 109

Unemployment rate: 4.4%

Kankakee County, Illinois
The Kankakee River flowing through Illinois.
The Kankakee River flowing through Illinois.

Median home price: $174,000

Percent of income required to buy a house: 27.9%

Number of underwater mortgages: 2,960

Foreclosure filings: 63

Unemployment rate: 5.3

Will County, Illinois
A view of Joliet, Illinois.
A view of Joliet, Illinois from a pedestrian bridge.

Median home price: $280,000

Percent of income required to buy a house: 40%

Number of underwater mortgages: 12,130

Foreclosure filings: 479

Unemployment rate: 4.1%

Madera County, California
A view of Madera, California.
Downtown Madera, California.

Median home price: $400,000

Percent of income required to buy a house: 53%

Number of underwater mortgages: 1,209

Foreclosure filings: 61

Unemployment rate: 6.3%

Kane County, Illinois
aurora illinois
An older apartment building in Aurora, Illinois.

Median home price: $299,000

Percent of income required to buy a house: 41.2%

Number of underwater mortgages: 9,351

Foreclosure filings: 231

Unemployment rate: 4.3

Richmond County, New York
staten island ferry new york city
Richmond County encompasses New York's Staten Island.

Median home price: $630,000

Percent of income required to buy a house: 70.1%

Number of underwater mortgages: 3,441

Foreclosure filings: 275

Unemployment rate: 4.9

Atlantic County, New Jersey
Atlantic City's boardwalk, featuring the Bally's casino.
Atlantic City's boardwalk, featuring the Bally's casino.

Median home price: $279,950

Percent of income required to buy a house: 38.1%

Number of underwater mortgages: 6,523

Foreclosure filings: 190

Unemployment rate: 4.1

Passaic County, New Jersey
An aerial view of Paterson, New Jersey.
An aerial view of Paterson, New Jersey.

Median home price: $450,000

Percent of income required to buy a house: 59.6%

Number of underwater mortgages: 5,267

Foreclosure filings: 213

Unemployment rate: 3.8%

Butte County, California
A view of Chico, California
A view of Chico, California.

Median home price: $392,000

Percent of income required to buy a house: 51.6%

Number of underwater mortgages: 2,168

Foreclosure filings: 93

Unemployment rate: 4.4%

Kent County, Delaware
dover delaware
The Delaware State Capitol Building in Dover.

Median home price: $320,000

Percent of income required to buy a house: 39.3%

Number of underwater mortgages: 2,203

Foreclosure filings: 128

Unemployment rate: 4.7%

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