The central measured tension in 19125 is that a $1,870 typical asking-rent index sits at an arithmetic 20.5% of ZIP median household income, yet the ZIP also has a meaningful surveyed rent-burden share. At the stated Zillow endpoint, the implied annual income needed to keep that monthly index at 30% of income is $74,800. This is a mechanical required-income screen, not affordability advice and not an applicant qualification rule. It frames the current asking-rent level against area-wide income, while leaving substantial room for differences among households, unit types, lease terms, and included costs.
Backward-looking Zillow history points to continued, relatively steady asking-rent appreciation rather than a recent break from the longer path. The exact same-month one-year change was 3.95%, compared with 2.74% annualized over three years and 3.48% over five years. Thus, the latest year was faster than both longer windows, but still confirms positive longer-run movement instead of reversing it. Monthly-return variability annualized to 2.19%, supporting more confidence in the current index than a highly erratic series would. A 2.77% maximum drawdown also indicates that the observed historical setback was limited. Coverage was 100%, with 136 monthly observations and 135 consecutive returns. Transparent national discovery ranks, where lower is stronger, were 876 for momentum, 285 for stability, and 249 for the balanced measure. These are historical measurements, not forecasts or investment recommendations.
Zillow’s ZIP figure is a typical observed asking-rent index blended across rental types; it is not a survey median for occupied homes. The five-digit 19125 label is both a Zillow ZIP market identifier and a matched Census ZCTA, but a ZCTA is a statistical area and is not identical to a USPS delivery ZIP. In the ACS 2024 five-year survey of occupied renter homes, median gross rent was $1,782 with a $101 margin of error, and gross rent includes selected utilities. The matched ZCTA’s median household income was $109,554, with an $11,874 margin of error. Those different populations, timing conventions, and rent definitions mean the asking index and ACS gross-rent median should be compared as context rather than treated as interchangeable readings.
The bedroom view is intentionally modelled rather than measured. Scaling ZIP ZORI by the local HUD ladder produces monthly modelled estimates of $1,447 for a studio, $1,569 for one bedroom, $1,870 for two bedrooms, $2,244 for three bedrooms, and $2,504 for four bedrooms. These are not observed bedroom rents or rental comps. The FY2026 HUD FMR/SAFMR two-bedroom administrative standard is $2,300, placing the ZIP’s two-bedroom modelled estimate at 81.3% of that standard. HUD FMR/SAFMR is a bedroom-specific administrative benchmark, not asking rent; its role here is to supply the local bedroom ladder used to scale the blended ZIP index.
The ACS housing profile supplies a separate view of occupancy, stock, and renter exposure. It reports 9,808 single-family units and 1,275 large multifamily units, alongside 1,166 vacant homes, an 8.6% vacancy rate, and 218 homes vacant for rent. Renters occupied 41.4% of occupied homes, while 37.0% of renter households reported gross-rent burdens at or above the 30% threshold. That burden measure is not evidence about any particular lease or unit. For wider comparison, Philadelphia city context and Philadelphia County context each place the asking-rent index at about $1,814, while Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro context is $1,928; these are city, county, and metro context values, respectively, rather than ZIP observations. The city-context burden share of 52.3% is higher than the ZIP survey reading, but it does not explain why either geography differs.
Redfin supplies a different, direct ZIP resale observation from its rolling three-month for-sale window. In that resale universe, the median sold price was $419,905, up 3.68% year over year, with 153 homes sold and a median 49 days on market. Inventory was 207 homes and months of supply was 4.1. The average sale-to-list result was 99.2%, while 34.9% of sales closed above list price; these are for-sale signals, not rental transactions or rental comps. Annualized ZIP ZORI divided by Redfin’s median sold price produces a 5.34% cross-source screening ratio only. It is not a cap rate, net return, expected return, or property yield. Resale price growth broadly aligns with the positive rent-history direction, while the marketing time and supply figures add a distinct liquidity lens that the rent index cannot provide.
Read together, the evidence does not resolve the affordability tension into a single conclusion. The income-based rent screen looks less stretched than the surveyed burden share, but the measures cover different concepts: a current blended asking index versus five-year ACS gross-rent reports from occupied renter households. The modest historical variability raises confidence that one current asking-rent snapshot is not dominated by large recent swings, yet it cannot establish the market rent of an individual home. Likewise, the resale statistics show transactions and sale-market conditions directly within the ZIP, but cannot convert a typical asking-rent index into property economics. The useful decision distinction is between stable aggregate rent movement, uneven renter-household burden exposure, and a resale market observed through separate measures.
Important limits remain at the property level. The ZORI value does not identify the advertised rent, availability, concessions, utilities, condition, furnishing, lease duration, or bedroom count of a specific unit. ACS margins of error and its five-year collection period limit precision for a current decision, while HUD standards are administrative rather than market quotes. Redfin’s sold-price and liquidity measures should be checked against the relevant property’s sale history, list history, physical characteristics, and directly comparable completed sales rather than against rentals. A reader should also verify the actual advertised rent, which utilities are included, bedroom configuration, current availability, and any applicable transaction records before relying on these aggregate screens. Can the specific property’s documented terms and comparable evidence support the aggregate ZIP picture?
","findings":[{"body":"Zillow history shows a 3.95% exact same-month one-year increase, exceeding the 2.74% three-year and 3.48% five-year annualized changes. That pattern supports continued positive rent movement rather than a reversal. Low measured variability and a limited maximum drawdown make the current ZIP index more informative than a highly volatile single-period observation, while remaining strictly backward-looking.","title":"Recent rent growth remains aligned with the longer record"},{"body":"The current asking-rent index equates to 20.5% of matched-ZCTA median household income, and the arithmetic 30% screen implies $74,800 of annual income. Yet 37.0% of surveyed renter households reported gross-rent burdens at or above 30%. This is a definitional and distributional tension, not contradictory proof about a particular renter or unit.","title":"Income screen and renter burden point to different populations"},{"body":"The studio-through-four-bedroom figures are modelled estimates created by applying the local HUD bedroom ladder to the blended ZIP asking-rent index. They provide a consistent way to express size differences around one ZIP-level index, but they do not measure advertised or signed rents for specific bedroom categories. HUD’s standard remains administrative and should not be substituted for asking rent.","title":"Bedroom figures are scaling outputs, not rental comps"},{"body":"Redfin’s direct rolling-three-month ZIP resale data show positive year-over-year median sold-price movement, consistent in direction with the rent-history record. At the same time, days on market and months of supply provide a separate for-sale liquidity perspective that rent data do not contain. The annualized-rent-to-sold-price figure is only a cross-source screening ratio, not a property return measure.","title":"Resale evidence confirms price movement but adds liquidity caution"}],"risks":["The ZIP asking-rent index blends rental types and does not establish the rent, utilities, concessions, condition, availability, or lease terms of any particular apartment, house, or advertised listing.","ACS figures describe a matched statistical ZCTA through a five-year survey period and carry margins of error, so they should not be treated as a current census of renters or housing units.","HUD FMR/SAFMR values are administrative bedroom-specific standards, while the bedroom values here are modelled from the ZIP index; neither source is evidence of measured rents for a specific unit.","Redfin resale observations describe sold homes and for-sale liquidity only. Dividing annualized asking rent by median sold price omits property-specific costs, financing, taxes, maintenance, vacancies, and transaction details."],"qa":[{"a":"The current figure is Zillow ZORI for the ZIP market identifier: a typical observed asking-rent index blended across rental types. It is not a signed-lease average, a median of occupied renter homes, a utility-inclusive gross-rent measure, or the advertised price of a specific vacant unit.","q":"What does the current Zillow rent figure represent?"},{"a":"They should be read as modelled monthly estimates that scale the ZIP-level Zillow index using the local HUD bedroom ladder. They are useful for expressing a consistent size pattern around the index, but they are not measured studio, one-bedroom, two-bedroom, three-bedroom, or four-bedroom market rents.","q":"How should the bedroom estimates be used?"},{"a":"Redfin reports a direct rolling-three-month ZIP resale observation, including sold prices, sales activity, marketing time, inventory, supply, and sale-to-list outcomes. Those measures describe the for-sale market rather than rental transactions. They can provide separate market context but cannot serve as rental comparables or property-level operating economics.","q":"Why are the Redfin figures separate from the rent evidence?"},{"a":"No. The required-income figure is simple arithmetic based on holding the ZIP asking-rent index to 30% of annual income. It is not financial advice, a tenant-screening standard, or an applicant qualification rule. Actual affordability depends on household income, unit rent, utilities, obligations, lease terms, and other circumstances not supplied here.","q":"Does the required-income screen show whether a renter can afford a unit?"}],"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 and Small Area FMRs — ZIP rent 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