For 2013, the median household income in Colorado was $63,371. In the US for the same period, it was $51,939.
As we can see in the first graph, the Colorado median income level has been above the US level since 1990.
We can also see that over time, this gap has been growing. The second graph shows the gap between the Colorado median income and the US median income:
The gap was negative from 1986 to 1989 when Colorado's median income was lower than the US. But since then, the gap has generally grown, and reached $10,000 for the first time in 2007. In fact, 2013's gap was the largest ever recorded with Colorado's median income coming in at 11,432 above the US level.
The final graph shows percentage change in median income for each area. Colorado's YOY changes are much more volatile, as would be expected from an area so much smaller than the US overall. The sheer size of the US and its economy prevent large swings. However, there is a slight downward drift in the US median income increases over time. In other words, US median income seems to be going up by a smaller amount over time. In Colorado, what was a downward drift during the 1990s, appears to have stabilized somewhat since 2003. The YOY change in Colorado from 2012 to 2013 (10.6 percent) was the second largest ever recorded, second only to 1990's growth rate of 14.6 percent. The US rate of change for 2013 was 1.8 percent.