The central tension in 19144 is that the current asking-rent signal sits well above the resident-survey rent measure, even though the same label links the data. In June 2026, Zillow ZIP ZORI is $1,511 per month. ZORI is a typical observed asking-rent index blended across rental types, rather than a lease-level quote or a measured rent for one bedroom count. This label is both a Zillow ZIP market identifier and a matched Census ZCTA; a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. In the ACS 2024 five-year survey, median gross rent is $1,153 for occupied renter homes and includes selected utilities, with a $65 ACS margin of error. The asking index is 31.0% higher, a source-and-timing contrast rather than evidence about any particular home.
Same-month history places that snapshot in a stable-growth path: the 1-year change was 4.35%, the 3-year change 4.32%, and the 5-year change 5.13% annualized. The near-match between the recent and middle horizons confirms the longer upward direction, while the recent pace is below the full-period pace; it does not establish a future trajectory. Annualized monthly-return variability was 2.30%, and maximum drawdown was a 1.12% decline. Coverage was 100% across 114 observations. The transparent national discovery ranks among history-eligible ZIPs were 508 for momentum, 404 for stability, and 111 for balanced history, where a lower rank is higher. These are backward-looking measurements, not forecasts or investment recommendations. The reported variability and shallow recorded setback support more confidence in the index as a current benchmark than a highly erratic series would, but they do not convert it into a property-specific rent.
Bedroom sizing should therefore be read as a model, not as another set of observations. Scaling the ZIP ZORI by the supplied local HUD ladder produces modelled monthly estimates of $1,166 for a studio, $1,268 for one bedroom, the ZIP index for two, $1,809 for three, and $2,024 for four. These are modelled estimates, never measured bedroom rents. The FY2026 HUD FMR/SAFMR ladder is an administrative, bedroom-specific standard—not asking rent—and shows $1,250 for a studio, $1,620 for two bedrooms, and $2,170 for four. The matching two-bedroom modelled estimate and ZORI result from the scaling method, not proof that asking rents center on a particular two-bedroom unit. The supplied HUD ladder may be ZIP SAFMR or county-derived; its role here is to set relative bedroom steps.
The income and burden evidence frames the mismatch without resolving it. Applying the 30% required-income screen to the ZORI yields $60,440 annually, versus an ACS ZCTA median household income of $53,161; the same arithmetic puts asking rent at 34.1% of that income. This screen is arithmetic, not advice or an applicant qualification rule, and household income is not unit-level income. In the ACS survey, 7,280 of 13,983 renter households were estimated to pay that threshold or more of income toward rent, or 52.1%. This burden measure describes surveyed occupied renter households, not the present ZORI universe, and cannot prove the payment position of an individual tenant or the affordability of a particular listing. Survey margins of error also qualify both the income and burden estimates.
Stock data similarly show market context, not a unit-availability finding. The ACS ZCTA reports 24,162 housing units and a 7.8% vacancy rate; 498 vacant homes were classified as for rent. Those are area-level counts and cannot establish that a particular unit is available, comparable, or priced at the ZORI. Renter-occupied homes account for 62.8% of occupied units, making renters the larger tenure group in this statistical area. The reported structure mix includes 11,431 single-family units and 5,628 units in large multifamily buildings, while other structure categories complete the housing stock. This composition documents the survey’s housing base; it does not identify which building types generate today’s advertised inventory.
For wider-context comparisons only, the City of Philadelphia Zillow context rent is $1,814, Philadelphia County’s context rent is $1,814, and the Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro context rent is $1,928; all are above the ZIP index. City and county context renter shares and vacancy rates are not substitutes for the ZCTA measures, and the metro’s rental and income indicators are not a ZIP forecast. The comparisons establish scale differences across named geographies, not an explanation for them or a ranking of individual properties.
Dates, definitions, and property checks remain decisive. ZORI reflects current ZIP-level asking-rent observations, ACS reflects a multi-year survey of occupied renter homes, and HUD reflects an administrative standard; none is interchangeable with a signed lease. Concrete property-level checks include the advertised asking rent and current availability, bedroom designation, utilities included in the quoted payment, lease term and move-in charges, and whether a HUD-based program actually uses the applicable standard. The listing geography should also be matched to the relevant market identifier rather than assuming a USPS delivery ZIP and ZCTA have the same boundary. Which evidence universe does the property itself actually match?
","findings":[{"body":"Zillow’s June 2026 ZIP ZORI is $1,511, whereas ACS 2024 five-year median gross rent is $1,153. The 31.0% spread should not be read as conflicting estimates of the same thing: ZORI tracks typical observed asking rents across rental types, while ACS describes occupied renter homes and includes selected utilities. The matched ZCTA is statistical and does not duplicate USPS delivery-ZIP boundaries.","title":"Current index exceeds survey median"},{"body":"Same-month Zillow changes were 4.35% over one year, 4.32% over three years, and 5.13% over five years. Monthly-return variability annualized to 2.30%, maximum drawdown was 1.12%, and coverage was complete. The recent pace therefore continues the historical rise but trails the longer-period pace. These measurements characterize past ZORI behavior only, not a forecast, property underwriting input, or investment conclusion.","title":"Recent growth continues the prior path"},{"body":"Modelled bedroom estimates run from $1,166 for a studio to $2,024 for four bedrooms, with $1,268, $1,511, and $1,809 at the intervening bedroom counts. They are formed by scaling ZIP ZORI with the local HUD ladder. The HUD FMR/SAFMR inputs are administrative standards, not observed asking rents, so none of the bedroom figures should be treated as a measured market rent.","title":"Bedroom figures are HUD-scaled models"},{"body":"Among occupied units, renters account for 62.8%, while the ZCTA vacancy rate is 7.8% and 498 homes are classified vacant for rent. Wider-context rents are $1,814 for the City of Philadelphia, $1,814 for Philadelphia County, and $1,928 for the metro. These comparisons describe different geographic scopes; vacancy classifications do not establish availability or price at any specific address.","title":"Renter-majority stock sits below wider rent contexts"}],"risks":["Zillow ZORI, ACS gross rent, and HUD standards differ in date, population, treatment of utilities, and purpose. Combining them as though they are interchangeable measured rents can create a false address-level conclusion.","Historical stability is based on prior monthly ZORI observations. Even with full coverage and a shallow drawdown, it cannot establish future rent changes, cash flow, investment performance, or an actual listing’s price.","The vacancy and vacant-for-rent counts are ZCTA-level survey classifications, not a live inventory feed. They cannot demonstrate that any specific property is available, comparable, habitable, or offered at the benchmark.","ACS income, burden, and housing counts are estimates with sampling uncertainty, while the ZCTA and USPS delivery ZIP need not share boundaries. Applying area medians to an individual household or property is therefore limited."],"qa":[{"a":"The measures intentionally cover different universes. Zillow ZORI is a current typical observed asking-rent index across rental types, whereas ACS median gross rent summarizes occupied renter homes in a multi-year survey and includes selected utilities. Their differing dates, populations, and utility treatment prevent a one-to-one comparison for a specific address.","q":"Why is Zillow ZORI higher than ACS gross rent?"},{"a":"No. The studio through four-bedroom amounts are modelled estimates created by scaling ZIP ZORI with the local HUD FMR/SAFMR ladder. HUD is an administrative bedroom-specific standard rather than an asking-rent dataset. The two-bedroom model aligns with ZORI because of the scaling anchor, not because a sample of two-bedroom listings was measured.","q":"Are the bedroom estimates observed market rents?"},{"a":"It is a simple annual-income arithmetic check: paying the ZORI at the stated share produces $60,440. It is not a recommendation, underwriting test, or applicant qualification standard. The ACS median household income comparison is area-level survey context, while individual household income, utilities, and actual contract rent may differ substantially.","q":"What does the required-income screen mean?"},{"a":"The similar one-year and three-year gains, complete coverage, modest annualized variability, and shallow maximum drawdown indicate a comparatively steady past ZORI series. That supports using the current index as a more stable area benchmark than a highly erratic series, but it remains backward-looking and cannot forecast rents or verify a property’s asking price.","q":"How should the historical series affect confidence in the current figure?"}],"sources":[{"key":"apartment_list_time_on_market","name":"Apartment List Time on Market — listing liquidity","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/category/data-rent-estimates"},{"key":"apartment_list_vacancy","name":"Apartment List Vacancy Index — rental vacancy","release":"Apartment List 2026-07","pulledAt":"2026-08-08","url":"https://www.apartmentlist.com/research/apartment-list-vacancy-index-methodology"},{"key":"census_zcta_facts","name":"Census ACS five-year — ZCTA housing and income","release":"ACS 2024 5-year ZCTA","pulledAt":"2026-08-08","url":"https://api.census.gov/data/2024/acs/acs5.html"},{"key":"hud_zip","name":"HUD USPS crosswalk 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