Flowers is the kind of company where employees spend their lifetime. The former chief executive and current executive chairman, George Deese, has worked there since 1964. Like nearly all of the company’s executives, he has made individual contributions to Republican candidates and committees.

Allen Shiver, the recently appointed chief executive, worked his way up through the company after joining in 1978 as a route salesman. He has given money to only two candidates, John McCain and Saxby Chambliss, the Republican, of course, senator from Georgia. Most of his donations go to the PACs of the American Bakers Association and Grocery Manufacturers Association.

Charles Bullock, a professor of political science at the University of Georgia, said that Flowers Foods and its executives “have some visibility” in the state’s political circles, but he would not describe them as major Georgia power brokers. Republican roots often took hold first in the rural southern portions of the state, he said, even when Georgia was electing Democrats to statewide office.

The company’s website makes no mention of political philosophy or activism — not a surprise because Flowers is a publicly traded company. (The 95-year-old company reported net income in the most recent fiscal year of $230.9 million on sales of $3.75 billion.) Koch Industries, which is a private firm, has set up a site to respond to news media reports about its political activity. Flowers did not respond to several attempts to get comment.

Although firms like Flowers that make and sell food products have traditionally favored Republicans over Democrats, that split is typically a 2-to-1 ratio. Flowers is the only food company with a PAC that consistently gives more than $100,000 per election cycle to Republicans and nothing to Democrats.

Donors who list the company as their employer exhibit the same Republican-leaning behavior. They have given a total of less than $5,000 to Democratic federal candidates since the end of the Reagan presidency, compared with at least $509,000 to Republican candidates and committees during that time, according to the Center for Responsive Politics.

The partisan alignment of individual contributors within industries has been explored by Adam Bonica, an assistant professor at Stanford, who says few corporations are so strongly partisan in either direction. Google, which Mr. Bonica points to as having employees who favor Democrats, has roughly split its PAC giving in the current cycle between the two parties and has never veered beyond a 60-40 split for either party since being formed in late 2006.