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Pennsylvania

Mechanicsburg
Corporate Headquarters
6779 Carlisle Pike
Mechanicsburg, PA 17050
(717) 766-7671
(800) 33-GROFF (47633)
Ephrata
20 Stauffer Ln
Ephrata, PA 17522
(717) 738-0220
(888) 66-GROFF (47633)
State College
Penn Eagle Industrial Park
210 Rolling Ridge Rd
Bellefonte, PA 16823
(814) 353-8400
(888) 47-GROFF (47633)
Cranberry Township
100 Smith Dr
Cranberry Township, PA 16066
(724) 898-1535
(877) 33-GROFF (47633)
Ebensburg
4355 Admiral Peary Hwy
Ebensburg, PA 15931
(814) 472-7300
(877) 97-GROFF (47633)
New Stanton
963 South Center Ave
P.O. Box 510
New Stanton, PA 15672
(724) 755-0124
(888) 82-GROFF (4763)

New Jersey

Vineland
551 N. Harding Hwy
Vineland, NJ 08360
(856) 697-1414
Totowa
200 Bomont Pl
Totowa, NJ 07512
(973) 785-4900
Freehold
212 Monmouth Rd
Freehold, NJ 07728
(732) 780-4600

Maryland

Frederick
1561 Tilco Dr
Frederick, MD 21704
(800) 951-2550
(301) 682-4441
Baltimore
2300 Eskow Ave
Baltimore, MD 21227
(800) 218-9462
(410) 247-7454
Aberdeen
629 S. Philadelphia Blvd
P.O. Box 340
Aberdeen, MD 21001-0340
(800) 737-0049
(410) 575-6580
Upper Marlboro
6300 Crain Hwy
Upper Marlboro, MD 20772
(800) 227-3580
(301) 627-3938

Delaware

Greenwood
12420 Sussex Hwy
P.O. Box 338
Greenwood, DE 19950
(800) 756-9433
(302) 349-5760