Peoria, Ill., boasts the largest number of temporary workers as a percentage of total workforce of any U.S. city. Here is the full list of the 10 metropolitan areas with the highest temp penetration rates, according to new research from Staffing Industry Analysts:

1. Peoria, Ill.; 20.7 percent
2. Portland, Ore.; 7.3 percent
3. Greenville, S.C.; 5.7 percent
4. Niles-Benton Harbor, Mich.; 4.9 percent
5. Gainesville, Ga.; 4.2 percent
6. Grand Rapids, Mich.; 3.8 percent
7. Memphis, Tenn.; 3.6 percent
8. Fort Smith, Ark.; 3.6 percent
9. Morristown, Tenn.; 3.6 percent
10. Mansfield, Ohio; 3.5 percent

Corporate members of Staffing Industry Analysts can download the full report by clicking here.