When Gert Watkins pulls out a check at Wal-Mart or Target, the shoppers in line behind her roll their eyes, sigh deeply and mutter under their breath.

Ms. Watkins, a 67-year-old former banker in Birmingham, Ala., knows that many other shoppers pay with credit cards and debit cards, but she doesn't care.

"They make those faces, but I just turn around and say 'I will be through shortly, sweetie. It's my turn now,' " she says.

Check-writing may be dying, but it isn't dead yet. A sliver of consumers still clings to paper and pen, forgoing the ease of plastic for the rigor of balancing their checkbooks every month.

Such behavior is bewildering to more modern consumers brandishing payment apps and chip cards, some of whom don't even know how to write a check. To other shoppers, check-writers are the scourgeof the check-out line.

Michael Moeser was shopping at a Target in California on Black Friday a few years ago when a shopper ahead of him pulled out a check. In a matter of moments, other shoppers in line behind himscurried to other lanes.

"It was like a leper from the lepers' colony showed up," said Mr. Moeser, who works at a consulting firm tracking the payments industry.

For check-writers, recording the payment in a checkbook while standing in line is a sign of good financial hygiene. Everyone else says the behavior is as curious as buying a savings bond at thelocal bank branch or receiving a passbook when opening a savings account.

The practice of writing a check in a store is particularly mystifying to millennials, many of whom zap money to each other electronically through PayPal's Venmo, Facebook or Snapchat.

People who pay by check in stores say it gives them a greater feeling of security than using plastic and it is more convenient than carrying a wad of cash. They also say they feel more in controlof their spending.

"I just feel safer," says Bill Aber, a former chef who lives in Jersey City, N.J., and has been the victim of credit-card fraud.

Despite the relentless march of credit cards, debit cards and mobile payments, Americans wrote 17.3 billion checks in 2015, according to a survey released by the Federal Reserve last month. Thatcompares with the 41.9 billion checks written in 2000 when the Fed started conducting the survey, which it does every three years.

While check payments fell at an annual rate of 4.4% between 2012 and 2015, the drop represented a slowdown in the rate of descent for the first time.

Deluxe Corp., the big check-printing company, has tried to persuade shoppers that checks are worth using. The company launched a check-writing push in 2010 that featured a video starring "DuncanSteele-The Man with Checks Appeal" who writes a check to pay for a 59-cent stick of beef jerky in a convenience store.

"Credit cards are a sucker's game," he says with a wink to the annoyed people waiting in line behind him. By the video's end, the woman behind him stops rolling her eyes and leaps into hisarms.

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Go Ahead, Write a Check for Your Coffee, I've Got All Day(www.wsj.com/articles/go-ahead-write-a-check-for-your-coffee-ive-got-all-day-1485277398)