The five-digit 60640 label is both a Zillow ZIP market identifier and a Census ZCTA match; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. In June 2026, Zillow’s ZIP-level ZORI put the typical observed asking-rent index at $2,042 per month, 6.7% above the same month a year earlier. ZORI is a typical observed asking-rent index blended across rental types, rather than a lease quote for a defined unit. This current signal must therefore be read alongside, not merged with, household survey evidence. The central tension is a materially advancing asking-rent benchmark in a place where the other source universes describe residents, occupied homes, or administrative standards rather than the current listing market.
The backward-looking ZORI path is notably steady in its reported measurements. Exact same-month change was 6.7% over 1 year, 6.2% annualized over 3 years, and 7.1% annualized over 5 years. Thus the latest direction confirms rather than breaks from the longer growth path. Annualized monthly-return variability was 1.5%, maximum drawdown was -3.9%, and coverage was 100%. On transparent national discovery ranks among history-eligible ZIPs, it placed 116 for momentum, 9 for stability, and 5 for balance; lower ranks are higher. These are backward-looking measurements, not forecasts or investment recommendations. The limited variation and shallow prior decline support more confidence in a current rent snapshot than a highly erratic series would, without establishing what happens next.
The matched Census ZCTA’s ACS 2024 five-year median gross rent was $1,413. ACS median gross rent is a five-year survey of occupied renter homes and includes selected utilities; it is not an asking-rent series. The ZORI index is 44.5% above this survey median, but the gap is not evidence that any individual property charges that much more. The ACS survey observes occupied renter homes across its survey period, whereas ZORI blends current observed asking rents across rental types. These distinct timing, utility treatment, and unit universes mean neither figure should be substituted for the other in a unit-specific comparison.
The income arithmetic creates the sharpest affordability screen. Applying the current index to a 30% required-income screen produces $81,680 in annual income, compared with matched ZCTA median household income of $73,254. Expressed against that income benchmark, annualized index rent equals 33.5% of income. This is arithmetic, not advice and not an applicant qualification rule. ACS estimates 25,825 renter-occupied households and 11,564 households spending 30% or more of income on rent, a 44.8% burden share. That survey burden describes households in aggregate; it cannot prove a particular unit is affordable, unavailable, or burdensome for a particular applicant.
Bedroom detail should be used as a modelled allocation, not observed evidence. The modelled ZIP estimates, scaled from ZIP ZORI using the supplied local HUD ladder, are $1,696 for a studio, $1,811 for one bedroom, $2,042 for two bedrooms, $2,628 for three bedrooms, and $3,045 for four bedrooms. They are modelled estimates, never measured bedroom rents. HUD FMR/SAFMR is an administrative bedroom-specific standard, not asking rent. The local HUD ladder supplies relative scaling only and should not be treated as proof of a listing’s price, a lease outcome, or measured rent by bedroom within this ZIP.
Housing counts document stock and vacancy without proving current unit conditions. Of 41,362 housing units, 3,514 were vacant for an 8.5% overall vacancy rate; 1,304 were classified vacant for rent. The structure inventory includes 21,392 large-multifamily units. These are area-level stock and status counts, so the for-rent category is not confirmation that a specific apartment is actually available, comparable, or offered at the index. For wider context only, the City of Chicago city-context rent is $2,408.80, the Cook County county-context rent is $2,336, and the Chicago-Naperville-Elgin, IL-IN-WI metro-context rent is $2,275; each is above the ZIP-level index but none is a ZIP estimate.
The evidence has firm limits at property level. ZORI does not identify a unit’s contract rent, and ACS, HUD, stock, burden, and wider geographic context each use a different universe or purpose. For a specific property, check the advertised asking rent, bedroom designation, lease term, included utilities, mandatory fees, concessions, availability date, property type, and address geography before comparing it with these benchmarks. Confirm how the home’s characteristics fit—or fail to fit—the blended ZORI series. Neither the vacancy count nor the burden share proves availability, price, or affordability for any one unit. The relevant final question is not whether a benchmark is universally right, but which benchmark matches the property and household circumstance actually under review.