The U.S. job market extended its momentum into the new year as employers added 257,000 jobs in January and wages jumped. The overall unemployment rate ticked up to 5.7 percent, but the rate rose because of a good reason: More Americans felt encouraged enough to start looking for jobs, and because some didn't find work right away, they increased the number of unemployed.

The U.S. job market extended its momentum into the new year as employers added 257,000 jobs in January and wages jumped. The overall unemployment rate ticked up to 5.7 percent, but the rate rose because of a good reason: More Americans felt encouraged enough to start looking for jobs, and because some didn't find work right away, they increased the number of unemployed.

Jobless rates across most demographic groups were little changed from December, except for a jump in the rates for teenagers and recent veterans. Young workers in their early 20s enjoyed the biggest monthly improvement in their unemployment rate down a full percentage point to 9.8 percent.

The numbers underscore that some groups are faring far better than others, with historical gaps between racial and ethnic groups persisting.

At 10.3 percent, the unemployment rate for black Americans was more than double that of white Americans. The rate for high school dropouts was three times the rate for college graduates.

Recent veterans are also struggling. Though the nation has added more than 3 million jobs over the past 12 months, the January unemployment rate for veterans who served in Iraq and Afghanistan remained unchanged from a year earlier at 7.9 percent.

Unemployment rate by group:(Numbers in percentages)Jan. 2015Dec. 2014Jan. 2014White:4.94.85.7Black:10.310.412.1Asian*:4.04.24.8Adult men:5.35.36.3Adult women:5.15.05.9Teenagers:18.816.820.820-24 years old:9.810.811.925-54 years old:4.84.75.655 and over:4.13.94.5Veterans of Iraq/Afghanistan*:7.96.97.9No high school diploma:8.58.69.6High school graduate:5.45.36.5Some college:5.24.95.9College graduates:2.82.93.3Duration of Unemployment:Average length (weeks):32.332.835.3Jobless 6 months or more (percent):31.531.935.6*Not seasonally adjustedSource: Labor Department