63124 is the zip code for St. Louis' wealthiest suburb. Lots of pretty old houses. I grew up on the wrong end of Litzinger Avenue over in Brentwood - 63144. Litzinger has giant horse farm houses in the Ladue part, but once you pass the quarry, you're in Brentwood and the houses get smaller as you head east.
Where can you find the best mansards in St. Louis? In zip code 63104, of course, home to Soulard, Lafayette Square, Lasalle and Benton Park. see what I did there with the zip codes. 63104, 63144, 63124.