St. Louis County, St. Charles, and Jefferson: what the age data says for families planning care

Families in the St. Louis region often treat St. Louis County, St. Charles County and Jefferson County as a single west-and-south belt. The Census file does not. Each is its own county equivalent, with its own population and its own industry row. St. Louis County holds 199,345 residents aged 65 and over, 20.1 percent of a total population of 992,929, and 37.2 percent of the region's older adults. St. Charles County holds 76,887, 18.1 percent of 423,726. Jefferson County holds 41,443, 17.9 percent of 231,888. Those three counts already sit in different parts of the regional distribution. St. Louis County is first by count. St. Charles County is second. Jefferson County is sixth.

Share tells a quieter story than count. None of the seven Missouri counties inside the St. Louis region reaches the statewide top twenty by share aged 65 and over. Franklin County, at 20.3 percent, is the highest placed of that group. St. Charles County, at 18.1 percent, sits 20th lowest statewide. Jefferson County is 17th lowest at 17.9 percent. A low share here is not a small older population. It is a large county whose older residents are a smaller slice of a larger whole.

Keep the independent city out of these three rows. The city of St. Louis is a county equivalent of its own, with 46,992 residents aged 65 and over. It is not part of St. Louis County. If the person you are planning for lives in the city, you want the city row, not this comparison.

St. Louis County is the region's concentration. It holds 199,345 residents aged 65 and over, more than the next two counties together, as already stated on the county ranking page. It holds 22,623 residents aged 85 and over, more than the next three counties combined. Statewide it holds 17.0 percent of Missouri's 1,169,583 residents aged 65 and over, the largest county count in the state, ahead of Jackson County at 120,879.

The registered home care industry is also concentrated there. St. Louis County reports 242 establishments under NAICS 621610, a rate of 1.21 per 1,000 residents aged 65 and over, and 5,023 jobs in December 2024, a rate of 25.2 per 1,000, the highest published jobs rate in the region. It is still a mixed industry code, and it is still a county total, not a list of companies that will take your particular address. Place-level age counts are not published here.

If you are planning care in St. Louis County, the data's useful statement is scale. There are many older residents, including the largest 85-and-over count in the region, and there are many registered employers relative to the rest of the map. Scale does not tell you who has an opening. It tells you that a search starting inside the county has a larger local registration file to work from than a search starting in Jefferson County.

St. Charles County is the region's second count and a different supply picture. 76,887 residents aged 65 and over. 8,071 residents aged 85 and over, 1.90 percent of the county and 10.5 percent of its own older population. 35 home care establishments, a rate of 0.46 per 1,000. 524 jobs, a rate of 6.8 per 1,000. On establishments it sits well above Jefferson County and well below St. Louis County. On jobs it sits sixth of the seven rankable counties, behind Franklin County's 7.5, because those 35 establishments employ 524 people, an average of 15.0 per establishment as printed on the jobs page.

That combination is the one families misread. A county with 76,887 older adults sounds, in conversation, like a place where there must be plenty of agencies. The registration file says 35. The payroll file says 524 jobs in the mixed home care code. If you are hiring in St. Charles County, start from those published figures rather than from the county's reputation as a large, growing place.

Share is not the hiring problem. Count is. A family that only looks at St. Charles County's 18.1 percent share will think it is a younger county and stop. A family that looks at count will see the second largest older population in the region and keep going.

Jefferson County holds 41,443 residents aged 65 and over, sixth in the region, on a total population of 231,888. It reports 3 home care establishments, a rate of 0.07 per 1,000, the lowest computed supply figure on this desk, and 86 jobs, a rate of 2.1 per 1,000, the lowest published jobs rate. The jobs page notes that this is roughly one twelfth of the St. Louis County jobs rate for a county that shares a border with it. That comparison is already published. This page does not add a new one.

Jefferson County's older population also skews younger inside the 65-and-over band. Of its 41,443 residents aged 65 and over, 3,040 are aged 85 and over, 7.3 percent, the lowest such internal share in the fifteen-county region. St. Louis County's internal share is 11.3 percent. The 85-and-over page states what that means: Jefferson County's older population skews younger than its neighbours, rather than that it holds few older adults. For a family planning several years out, that is a different fact from today's office count. Today's office count is still three.

If you are hiring in Jefferson County, the registration file is short. The neighbouring counties' files are not. The honest reading is to treat Jefferson County's row as a description of local registration, then ask companies based in St. Louis County, the city, or St. Charles County whether the address is inside their service area. This desk cannot see those routes. It can tell you the local row is the thinnest computed rate in the region.

Count of residents aged 65 and over answers where the older population is. Count of residents aged 85 and over answers where the oldest part of that population is. St. Louis County: 22,623. St. Charles County: 8,071. Jefferson County: 3,040. As a share of total population those figures are 2.28 percent, 1.90 percent and 1.31 percent. As a share of each county's own residents aged 65 and over they are 11.3 percent, 10.5 percent and 7.3 percent. All six of those numbers are already on the 85 and over table.

This desk does not convert either column into a caseload. It does tell you that St. Louis County holds the largest 85-and-over count in the region, that St. Charles County holds the second, and that Jefferson County's older population is less concentrated at the oldest ages than its two neighbours. Statewide, every St. Louis region county sits below the top 45 of 115 on residents 85 and over as a share of residents 65 and over. The leader on that page is DeKalb County at 16.7 percent, not the metro belt.

Use it to stop treating the three counties as interchangeable. St. Louis County has the largest older population and the densest published registration. St. Charles County has a large older population with a thinner registration file. Jefferson County has a still-large older population with the thinnest computed registration in the region. Those are three different searches, even when the households sit an hour apart.

Use it to decide where to look, not whom to hire. If you live out of town and you are trying to understand which county the house is actually in, start with the county ranking and the supply ranking, then confirm the address against a company's own towns. A daughter managing this from another state has a longer list of remote tasks than a county table can cover; Far Away Daughter is written for that distance. If the plan is to keep the person in that house rather than move them, the county comparison tells you how much local industry you are relying on, and Keep Her Home is written for the household side of that plan.

Do not add the three counties together. This desk has not published a combined total for them, and a combined total would hide the supply gap that is the point of the comparison. These counts come from the Census Bureau's population estimates, documented in the Bureau's estimates methodology, and they count residents by age. The rest of the limits sit on the methodology page.