St. Louis is owner-occupied: 29.6% rent against 34.8% nationally. Across 1,160,386 households the demand is homeowner-driven, which means word of mouth and repeat customers matter more here than they do in a turnover-heavy metro.
58.3% of homes in St. Louis were built before 1980, against 49.7% nationally. Older housing means renovation debris, basement and attic clearances, and estate cleanouts when a long-held home changes hands. Across 1,160,386 households that is steady, unglamorous, repeatable work.
St. Louis has 1,160,386 households across a population of 2,810,850. Junk removal demand tracks households more closely than anything else: people move, renovate, downsize and clear out, and every one of those is a job for someone with a truck and a crew.
Where these figures come from
Every number in these paragraphs is a Census figure for the St. Louis metro, compared with the national figure from the same table.