Milwaukee and San Francisco saw the highest percentage growth in manufacturing jobs over last year, according to a new analysis by the statistics firm Wanted Analytics.

The Milwaukee-Waukesha-West Allis, Wisconsin area saw a 33.5% increase in manufacturing jobs over the same time period last year.

San Francisco saw a 26.5% increase, and Dallas, 16.7%. Chicago and New York also showed double-digit growth.

Milwaukee is home to some 118,000 manufacturing jobs, according to the latest census data. San Francisco is slightly higher, at about 124,000.

Among the manufacturers recently announcing expansions in Milwaukee is General Plastics.

The company is adding manufacturing equipment and hiring new employees as part of a two-year $4 million expansion project launched to keep up with growing demand.

General Plastics is adding 42,000 square feet of space to its existing Milwaukee plant and expects this $3 million expansion to be completed in October. The company also has added $1 million in manufacturing equipment.

The manufacturer of custom plastics products currently operates a 51,000-sq.-ft. production facility and a nearby 12,000-sq.-ft. warehouse. This current addition will give General Plastics a total of 93,000 square feet and increase its overall efficiency by putting all operations under one roof. The company — which currently has 70 full-time employees — expects to add another 15 jobs over the next 18 months.

The expansion project is necessary to keep up with increasing demand for the Milwaukee manufacturer’s customized products and services, according to Robert Porsche, president of General Plastics.