Retirees, widows, disabled workers and some children who qualify receive a monthly stipend through SSA programs. The money comes mainly from payroll taxes but also from reserves the SSA set aside known as the trust funds. Because of changing demographics — a historically low birth rate, increasing number of retirees and the fact that the average new retiree will live to age 85 — these reserves are projected to run dry by 2035, according to recent estimates.

Social Security will start relying entirely on taxpayers' money when the trust funds reach zero. The data show that on a cash-flow basis, the system already is paying out more than it takes in. Last year, the negative cash flow was $80 billion. That meant the Treasury had to borrow $80 billion so it could redeem Social Security trust fund securities to keep benefit checks flowing.

When the Social Security trust funds reach a zero balance the program will not be able to meet its obligations in full. This means when today's 51-year-olds reach retirement at age 67 in 16-years, beneficiaries will face a benefit cut unless Social Security's costs are curtailed, the program's revenue increases or some combination of the two is enacted. “At that point, all beneficiaries will face a 20 percent across-the-board benefit cut, which will grow to 25 percent over time,” according to the Committee for a Responsible Federal Budget.

The first wave of baby boomers began reaching retirement age in 2011 impacting U.S. demographics dramatically. Two years earlier, no state population had more than 15 percent of social security retirees but that's all changed. Last year, 14 states had a population made up of more than 15 percent retirees. Vermont, Maine and Florida had the highest proportion.

Migrating baby boomers are also contributing to robust population growth in some areas of the U.S.

The Villages in Florida, a popular retirement community in Florida's 11th Congressional District, is home to one of the fastest growing areas in the country. Retirees collecting social security made up a third of all residents in that district last year.

Key takeaways:

• The top three states with the highest proportion of beneficiaries are: Maine, Vermont and Florida Retirees comprise less than 10 percent in two states — Utah and Alaska — and 10.33 percent in Texas.
• In 2018, there were 43,721,450 OASDI beneficiaries in the U.S., according to Social Security Administration data. The Census Bureau estimated the total population to be 327,167,434 as of July 1, 2018, so close to 13 percent of the U.S. population is an OASDI beneficiary retired worker.
• Three southern Congressional districts have the lowest percentage of people collecting Social Security. Texas' CD-29, in the eastern portion of the Houston metro area, is the lowest at 6.48 percent. It's followed by California's CD-40 in east-southeast Los Angeles at 6.77 percent, the most Latino district in the nation, and Arizona's CD-7 at 6.92 percent.

Methodology

Bloomberg News analyzed Social Security data available per Congressional district for every year between 2005 to 2018 and grouped by state to avoid any redistricting problems — redistricting happened in 2012 effective January 2013, and some districts — like Florida's CD-11, were redrawn. Total population per state comes from the American Community Survey 5-year estimate Employment data come from the Bureau of Labor Statistics Bloomberg included data for only the 50 states

Read more: 

• Would-be retirees miscalculate Social Security benefit estimates
• Nearing retirement but not ready to fund it: Baby boomers
• Aging population could cut U.S. 2096 output 39%: economists

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