Counties / Illinois / Monroe County

Monroe County, IL

FIPS 17133 · population 35,036 · part of St. Louis, MO

$332k
Zillow home value · 2026-06
The numbers

What this county costs and earns

Everything here joins on the county FIPS code, so each figure comes from the agency that publishes it with no name matching in between.

Zillow home value
$332k
▲ 4.9% year over year
Zillow ZHVI · direct
ACS median gross rent
$1,042
occupied-unit survey; not current asking rent
Census ACS · surveyed
Gross yield
n/a
gross yield cannot be computed without measured market rent
requires both measured price and measured rent
HUD 2-bed standard
$1,218
the Section 8 payment standard
HUD Fair Market Rent · direct
Independent price check

Do two methods point the same way?

Zillow estimates a current home value. FHFA tracks repeat mortgage transactions. Their growth rates should be read side by side, not averaged.

Both annual signals move in the same direction
FHFA five-year cumulative+49.4%not annualized · through 2025
0%ZILLOW ZHVI2026-06+4.9%FHFA HPI2025+6.5%
Annual changes use different methods and may use different periods. The comparison checks direction and magnitude; it does not create a blended estimate. Zillow county ZHVI pulled 2026-07-26; FHFA annual county HPI pulled 2026-07-28.
Owner-reported value$282k
Surveyed gross rent$1,042
Rent burden 30%+46.9%
Median year built1990
Housing composition

Who occupies the stock—and what it is

ACS 2024 5-year
6.2%vacant
14,759estimated housing units
Occupied tenure15.3% renter
owner 84.7%renter 15.3%
Structure mix87.2% single-family
Single-family 87.2%20+ units 1.8%Mobile home 1.9%Other 9.1%
ACS estimates describe the standing housing stock and occupied tenure. They do not measure current listings, transaction prices or asking rents.

Survey source: Census ACS 5-year — county housing value, tenure and stock · ACS 2024 5-year · pulled 2026-07-30. These values describe different housing universes and are not combined into gross yield.

Annual average covered jobs8,573▲ 1.6% from the prior annual release
Covered establishments820annual average reporting locations
Average weekly wage$994▲ 6.1% from the prior annual release
Largest private supersectorTrade, transportation, and utilities21.6% of disclosed private covered jobs
Local labor base

Jobs, pay and private-sector concentration

2025
0%COVERED JOBS+1.6%WEEKLY WAGE+6.1%Trade, transportation, and utilities21.6%
Annual QCEW counts cover jobs located at reporting establishments. The industry share uses disclosed private covered employment; it is not a resident-employment measure or a forecast.

Workplace source: BLS QCEW — county employment and wages · annual county employment and wages 2025 vs 2024 · pulled 2026-07-31. QCEW counts covered jobs located in the county, not employed residents or the metro score’s CES/LAUS series.

County brief

What the local evidence says

01Decision frame

Monroe County’s decision tension is price appreciation and apparently constrained visible supply against an unmeasured income side. Buyers able to verify unit-level rents, insurance and taxes should investigate; buyers needing demonstrated yield or reliable coverage should be cautious. Market rent is not published, so gross yield cannot be computed. HUD’s two-bedroom Fair Market Rent is a payment standard, not an estimate of asking rent.

02Housing economics

At Zillow’s 2026-06 observation, the median home value was $331,521 and its year-over-year change was 4.87%. FHFA’s 2025 annual repeat-transaction HPI, a resale index rather than a home value, rose 6.53% year over year and 49.38% over five years. These separate methods point in the same direction but cannot be averaged or treated as one interval. The 1.63% effective property-tax rate and $4,588 median annual tax increase carrying-cost scrutiny; with no published market rent, insurance or operating costs, net cash flow and affordability are not underwritable.

03Demand & competition

Realtor.com’s MLS evidence shows 50 active listings, a 39-day median marketing time, and 10.22% of listings with price reductions. Those are visible asking-market supply, marketing-time and seller-concession measures—not closed-sale prices or proof of buyer demand. Tax-return migration was negative 32 households, while average AGI of movers in exceeded movers out by $7,333, so count and income composition pull in different directions. Investors accounted for 27 of 396 purchases, or a calculated 6.82%; that is participation to examine, not a measure of rental performance.

04Risk & next checks

Inland flood is the dominant hazard, and modeled climate loss equals 0.17% of building value per year; it is a county-level modeled ratio, not a parcel loss estimate. QCEW’s annual workplace data identify Trade, transportation, and utilities as the largest disclosed private supersector; it is neither resident employment nor a forecast. Next checks are property-specific flood zone, elevation and insurance quotes; comparable asking rents, vacancy and lease terms; closed-sale comparables; tax bills; and financing terms. Their absence prevents a defensible yield, expense, resale or coverage underwriting conclusion.

Cities & communities

Where people live within Monroe County

Census-recognized incorporated places and CDPs that intersect this county. The list does not pretend to include every neighborhood or informal community.

Population scale

Largest Census places

ACS 2024 5-year
Waterloo city11.1KColumbia city*11.1KDupo village*3.9KValmeyer village1.1KHecker village*521Maeystown village65Fults village12
Bars use total place population, not a county-share estimate. An asterisk marks a place that crosses a county line.
Official directory

7 Census places

Population
  1. 01
    Waterloo cityIncorporated place
    11,129
  2. 02
    Columbia cityIncorporated place · spans 2 counties
    11,127
  3. 03
    Dupo villageIncorporated place · spans 2 counties
    3,879
  4. 04
    Valmeyer villageIncorporated place
    1,090
  5. 05
    Hecker villageIncorporated place · spans 2 counties
    521
  6. 06
    Maeystown villageIncorporated place
    65
  7. 07
    Fults villageIncorporated place
    12

Population is the total place-wide ACS estimate, not an allocated county share. A place crossing a county line is labelled explicitly. Source: Census ACS 5-year — cities and communities · ACS 2024 5-year · pulled 2026-07-30.

Risk, demand and competition

The three things a price does not tell you

01
Risk & carrying costFEMA NRI + Census ACS
Dominant hazardinland flooding

0.166% of building value expected lost per year

Effective property tax1.63%

$4,588 median annual bill

02
DemandIRS SOI household flows
Net migration-32

737 in · 769 out

Arriving vs leaving income+$7,333

$77,134 arriving · $69,801 leaving

03
CompetitionHMDA financed purchases
Purchases by investors6.8%

27 of 396 mortgages

investorother financed
Current listing pressure

What sellers and visible supply are doing

Realtor.com® Economic Research · county inventory 2026-06 · pulled 2026-07-28
Active listings50▼ 4.8% year over year
Median days on market39▼ 13.5% year over year
Listings price-reduced10.2%seller-concession signal
Median listing pricen/a▲ 2.9% year over year

Listing price is an asking price, not a closed sale. Quality-flagged county rows are withheld instead of displayed.

No rent index is published for this county.Zillow’s county rent series does not cover every county, and estimating one from a neighbouring county would be a guess wearing a number’s clothes. Everything above is measured here; for a rent figure, the St. Louis, MO page covers the wider market.
Same metro

The other counties in St. Louis, MO

A metro is an average of these. Which side of a county line a property sits on can change the tax bill, the hazard profile and the tenant pool.

CountyPopulationPriceRentYieldHazard
Monroe County35,036$332kn/an/ainland flooding
St. Louis County995,569$293k$1,4776.0%inland flooding
St. Charles County414,535$378k$1,7005.4%inland flooding
St. Louis city288,512$187k$1,3948.9%inland flooding
Madison County264,238$202k$1,1777.0%inland flooding
St. Clair County253,694$181k$1,3218.8%inland flooding
Jefferson County229,458$298k$1,4846.0%inland flooding
Franklin County105,950$273k$1,1565.1%inland flooding
Lincoln County63,057$319k$1,7506.6%inland flooding
Bear case

What can break the county thesis

  1. Unpublished market rent and operating expenses could leave acquisition income unsupported.
  2. Flood exposure and insurance costs may vary materially by parcel beyond the county modeled-loss ratio.
  3. County-level MLS, migration and employment indicators may not match the target submarket or property.
Underwriting questions

Before pricing a property

Can gross yield be calculated from this record?

No. Market rent is not published, and HUD Fair Market Rent is a payment standard rather than market asking rent.

How large is investor participation among purchases?

The record lists 27 investor purchases out of 396 total purchases, a calculated 6.82% share.

What hazard requires property-level diligence?

Inland flood is the dominant hazard; the county modeled climate-loss ratio is 0.17% of building value per year.