The Richmond Fed's monthly manufacturing index fell to a reading of 4 in August from 5 in July, below expectations for an increase to 7 in a survey compiled by Bloomberg.
In contrast, other regional manufacturing data already released have suggested a faster pace of expansion.
Released at the same time, the nonmanufacturing revenue index fell to minus 8 in August from minus 3 in July, continuing a string of declines for the readings outside of the manufacturing sector.