Paul L. Koenig, 81, a crop reporting expert who worked for the Department of Agriculture for 33 years, died of pneumonia Monday at Holy Cross Hospital in Silver Spring. He recently had fallen and broken a hip.

Mr. Koenig joined the crop reporting service of Agriculture in 1928, and was chief of the food and vegetable branch, head of land acquisition in the bureau of agricultural economics, and, from 1943 to 1946, chairman of the U.S. crop reporting board. At his retirement in 1961, he was executive assistant of agricultural estimates.

In 1945, Mr. Koenig was a delegate to the Third International Conference on Agriculture at Caracas, Venezuela. He traveled widely in Europe and South America to help improve methods of collecting agricultural statistics.

Mr. Koenig was born in Hazelton, Pa. He graduated from Pennsylvania State University in 1921 with a degree in agricultural economics. Until moving to the Washington area, he was an official of the Pennsylvania Department of Agriculture.

Until about 10 years ago, when he moved to Rossmoor Leisure World in Silver Spring, Mr. Koenig was a resident of Arlington. He was a past president of the Arlington Civic Association and an elder of Clarendon Presbyterian Church. He was also a member of the Kiwanis Club and an Elk.

Survivors include his wife, Edna L., of the home; two daughters, Janice Ross, of Auburn, Ala., and Beth Paul, of Berkeley, Calif.; a sister, Marie Stickler, of Three Rivers, Mich., and eight grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Interfaith Chapel, Rossmoor Leisure World, 3680 S. Leisure World Blvd., Silver Spring, 20906.