Mr. Davidoff's response is spot on. The general relationship is the greater the number of allowances you claim, the less tax withheld. Ideally you want the amount withheld to be as close as possible to your actual tax liability. If you withhold too little, you must pay, and in some cases, would incur a penalty.
For the county in southeastern Missouri, see Butler County, Missouri. Butler is a city in Bates County, Missouri, United States. The population was 4,219 at the 2010 census. The county seat of Bates County, the city is named for William Orlando Butler, a noted American military and political figure of the early and mid-19th century. It is located approximately fifty miles south of Kansas City, Missouri on U.S. Route 71-Interstate 49.
Fort Butler was in the town of Murphy. Murphy is the county seat. The county encompasses an area of about 455 square miles. It is about 32 miles from east to west and about 20 miles from north to south. There are two towns which embody the spirit and charm of small town America. They are Murphy, the county seat, and Andrews. There are also many small communities with colorful and unique names.