The employment of about 18,000 West Virginians has been directly affected by the federal government shutdown, and Sen. Joe Manchin, D.-W.Va., said a number of those workers are staying on the job — without pay, for now.

A look at how the shutdown is impacting West Virginia workers:

• The FBI’s largest division is located in Clarksburg and employs more than 2,500 federal workers. About two-thirds of the employees are working without pay while the rest have been furloughed until the shutdown ends.

• The Department of Treasury employs around 2,200 employees in Parkersburg. However, because a large number of employees are paid through a revolving fund separate from annual appropriations, almost 80 percent are exempt from the shutdown.

• The U.S. Bureau of Prisons has around 1,000 employees at seven federal correctional institutions, penitentiaries, and prison camps around the state. Nearly all of these staff, and particularly those working directly at federal prisons, are considered essential and will work without pay.

• The Coast Guard has more than 400 employees at three facilities in West Virginia. Both the Vessel Documentation Center and the Operations Center in the Eastern Panhandle have closed, and all civilian Coast Guard employees are furloughed without pay.

• Customs & Border Patrol operates its Advanced Training Center in Harpers Ferry, where hundreds of federal employees and contractors train more than 8,000 border agents each year. The center is closed during the shutdown.

• NASA employs around 200 full-time federal workers and contractors at the Independent Verification & Validation Center in Fairmont. All but one of the federal workers has been furloughed during the shutdown.

• The Green Bank Observatory is a critical employer in Pocahontas County. While it is operated by the National Science Foundation, which is closed during the shutdown, Green Bank’s funding is provided by both NSF and other sources, so it remains open.

• The Federal Aviation Administration employs around 120 people throughout the state. Of these, about 20 percent have been furloughed.

• Federal courts in West Virginia have enough funding through court fee balances and other funds to operate until next week before they will be impacted by the shutdown.

• West Virginia has a number of national parks and forests. These national recreation areas will remain open for visitors, but services will not be available, and non-essential employees have been furloughed.