The population of the City of Monte Vista was set at 4,733 in 1998, compared with a population of 4,324 in 1990. Total population of the city and the unincorporated areas surrounding it is estimated at approximately 9,700.

The 1999 figures for Rio Grande County are 12,205 compared to 10,770 in 1990. The population for the entire San Luis Valley is 46,469. This compares to 40,207 in 1990. The trend seems to be for gradual growth of the area.