Pesticide Usage United States - 2000 - by compound type  million lbs % Conventional Pesticides 970 21 Pesticidal Oils, etc 260 6 Wood Preservatives 660 14 Specialty Biocides 270 6 Chlorine 2,460 53 Total Pesticide Use  4.34 billion lbs

Pesticide Usage United States - 2000 - by user group   Group million lbs % pesticide use* Agricultural 958 77 Commercial and Industrial 151 12 Home and Garden 136 11 *Pesticide use in this table is only for conventional pesticides and pesticidal oils, the first two categories (rows) in the table at the left.

However, it seems that agriculture uses a lot of pesticides, but was is the dosage concentration over a large area, such as the state.  Here is current land use in the state (% only--if you want numerical values, the area of the state is 66,351 square miles):
 

Croplands	19%	Forestry	53%	Cities	2%
Livestock	18%	Parks	5%	Other	3%

Source:  Washington's Water Quality Plan to Control Nonpoint Pollution, April, 2000, Ecology Publication 99-26

Eventhough three times as much pesticides are used for agriculture as for all other uses (commercial, industrial, and home and garden), these other uses occurs mostly in cities over a land are that is 1/18th of that devoted to agriculture.  That means about six times the amount of pesticides are applied per acre in the cities than on agricultural lands.

(By my calculation, agricultural lands receive about 61 lbs/acre, and just using the home and garden number in cities yields 160 lbs/acre on residential land.)