"I'm sure there is a much larger population of blacks than Hispanics in Chicago."
According to the 2000 Census, blacks comprised 36.8% of residents in the City of Chicago while Hispanics comprised 26.0% and whites 42.0%. Of course, most Hispanics listed either white, black or "other" as their race, and only 13.6% of Chicagoans (mostly Hispanics, I'm sure)listed "some other race," so I would guesstimate that 11% of Chicagoans listed white and Hispanic and 2% listed black and Hispanic. The population of Chicago would thus be approximately 35% non-Hispanic black, 31% non-Hspanic white and 26% Hispanic of any race.
As for the suburbs, they are still overwhelmingly white Anglo, and white Anglos form a plurality of residents of Cook County as a whole. In Cook County, non-Hispanic whites are 47.6% of the population (the 2000 Census website gives info on non-Hispanic whites at the county level), while blacks (including Hispanic blacks, but they are less than 1% of the county totals) are 26.1% of the county population and Hispanics are 19.9%.
And when we also include the Lake, DuPage and Will County suburbs, it is clear that non-Hispanic whites still are a solid majority of metro Chicagoans. The population of those three counties is 76.72% white Anglo, 6.11% black and 10.62% Hispanic. Adding that to the Cook County totals, we get a metro Chicago population of 7,427,524, of which 55.64% are non-Hispanic whites, 20.58% are black (including less than 2% Hispanic blacks) and 17.34% are Hispanics of any race.
So the order in the Greater Chicagoland area is
1. Non-Hispanic Whites (way out in front)
2. Non-Hispanic Blacks
3. Hispanics
I think by the 2010 Census Hispanics will surpass blacks as the #2 group in the Chicago area, but I don't think non-Hispanic whites will drop below 50%.