The 20 cities where retirees need the biggest nest eggs

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One million dollars: There was a time when that amount of money signaled extravagant wealth. Just ask the people who shared Gilligan's Island with Thurston Howell III.

These days, it's essentially the minimum goal for many retirement savers. In fact, a LendingTree study shows that more than $1 million is required to retire with an "average lifestyle" in 147 of the 385 U.S. metro areas. 

Overall, Americans need $1,071,127 to retire, according to the study. LendingTree based its estimates on the average amount of money people spend annually in each metro area, subtracted Social Security benefits, and determined the nest egg that would be necessary to live the "average lifestyle" by taking distributions utilizing the 4% rule.

Not surprisingly, places like San Francisco, New York and other major in-demand areas with scarce land top the list. In San Francisco, the top spot on the list, it takes an average nest egg of $1,365,870 to retire. Meanwhile, only one area — Johnstown, Pennsylvania, east of Pittsburgh — requires less than $800,000 on average.

"Ultimately, each metro is unique and will have its own quirks that can make it more or less expensive," LendingTree senior economist Jacob Channel said in a statement. "This is true of metros that are ostensibly similar or that are in the same state. Anyone thinking about retiring in a given area should thoroughly research it before packing their bags and moving. Don't let your preconceived notions or vague ideas about an area dictate whether you choose to live there."

For a look at the 20 cities that require the most retirement savings, scroll down our slideshow below.

San Francisco
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San Francisco

Average annual spend: $64,545
Income needed minus Social Security: $54,635
Nest egg required at retirement: $1,365,870
The Statue of Liberty over the Scene of New york cityscape river
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New York City

Average annual spend: $63,501
Income needed minus Social Security: $52,623

Nest egg required at retirement: $1,315,587
San Diego, California Skyline
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San Diego

Average annual spend: $62,346
Income needed minus Social Security: $51,952
Nest egg required at retirement: $1,298,796
Rainbow over Hawaii skyline
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Honolulu

Average annual spend: $62,566
Income needed minus Social Security: $51,551
Nest egg required at retirement: $1,288,763
Aerial view of sunset over downtown San Jose in California
Uladzik Kryhin/Uladzik Kryhin - stock.adobe.com

San Jose

Average annual spend: $61,631
Income needed minus Social Security: $51,080
Nest egg required at retirement: $1,276,997
Los Angeles skyline with palm trees in the foreground
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Los Angeles

Average annual spend: $61,522
Income needed minus Social Security: $50,946
Nest egg required at retirement: $1,273,643
Colorful sunset over a Napa California vineyard
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Napa, California

Average annual spend: $61,247
Income needed minus Social Security: $50,610
Nest egg required at retirement: $1,265,259
Channel Islands Harbor
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Oxnard, California

Average annual spend: $61,247
Income needed minus Social Security: $50,610
Nest egg required at retirement: $1,265,259
miami skyline. Yachts sail on sea water to city
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Miami

Average annual spend: $60,477
Income needed minus Social Security: $50,372
Nest egg required at retirement: $1,259,300
Poughkeepsie NY -- Sky view
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Poughkeepsie, New York

Average annual spend: $61,522
Income needed minus Social Security: $50,209
Nest egg required at retirement: $1,255,220
During a break in the fog, afternoon sunlight shines on the hist
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Salinas, California

Average annual spend: $60,862
Income needed minus Social Security: $50,141
Nest egg required at retirement: $1,253,521

Panorama Top view scene of Washington DC down town which can see
Thananit/THANANIT - stock.adobe.com

Washington, D.C.

Average annual spend: $61,302
Income needed minus Social Security: $49,979
Nest egg required at retirement: $1,249,478
Panorama of Denver skyline at twilight.
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Denver

Average annual spend: $58,992
Income needed minus Social Security: $49,741
Nest egg required at retirement: $1,243,532
Vineyard in Santa Maria California
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Santa Maria, California

Average annual spend: $60,477
Income needed minus Social Security: $49,671
Nest egg required at retirement: $1,241,783
Santa Rosa Ca Sunset
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Santa Rosa, California

Average annual spend: $60,367
Income needed minus Social Security: $49,537
Nest egg required at retirement: $1,238,429
San Luis Obispo, California
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San Luis Obispo, California

Average annual spend: $60,202
Income needed minus Social Security: $49,336
Nest egg required at retirement: $1,233,398
People enjoying the view of a stunningly colorful sunset in Sant
Jeremy Francis 4086875901/Jeremy Francis - stock.adobe.com

Santa Cruz, California

Average annual spend: $60,147
Income needed minus Social Security: $49,269
Nest egg required at retirement: $1,231,721
Seattle Skyline at Sunset with Space needle
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Seattle

Average annual spend: $61,576
Income needed minus Social Security: $48,864
Nest egg required at retirement: $1,221,602
Alfred Zampa Memorial Bridge at Dawn
Chris LaBasco/Chris - stock.adobe.com

Vallejo, California

Average annual spend: $59,597
Income needed minus Social Security: $48,598
Nest egg required at retirement: $1,214,953
Maui Coast
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Kahului, Hawaii

Average annual spend: $59,927
Income needed minus Social Security: $48,331
Nest egg required at retirement: $1,208,274
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