At the reported ZORI period, five-digit ZIP label 04101’s Zillow Observed Rent Index (ZORI) is $2,389 per month. It is a typical observed asking-rent index blended across rental types, not a rent quoted for a specified property, a leasing concession, or a record of executed leases. For wider context, Portland city’s Zillow context rent is $2,429, Cumberland County’s Zillow context rent is $2,445, and the Portland-South Portland, ME metro’s Zillow context rent is $2,352. Those are city-, county-, and metro-scope context values, respectively, rather than replacements for ZIP evidence. The immediately useful tension is that this current ZIP asking-rent signal sits near surrounding ZORI context, while a separate renter-survey universe reports a much lower median for homes already occupied. That divergence makes the comparison of source definitions more important than a superficial ranking of the places.
Direct Zillow ZIP ZORI observations through June 2026 place the ZIP in the supplied stable-growth category. Exact same-month annualized change was 2.63% at 1 year, 3.80% at 3 years, and 5.60% at 5 years. The recent pace is positive but below each longer trailing rate: it continues the upward path rather than breaks it, while not confirming the faster growth embedded in the longer record. The series reports 100% coverage across the available historical window. Annualized monthly-return variability is 2.73%, and its maximum drawdown is 3.33%. These are backward-looking measurements rather than a forecast, causal account, or investment recommendation. The reported variation and drawdown support more confidence in a current index snapshot than a highly erratic series would, but they cannot settle the price or condition of a live listing.
Transparent nationwide discovery ranks are 909 for momentum, 1,118 for stability, and 687 for the balanced measure among history-eligible ZIPs; lower ranks are higher. They are a compact discovery device for the same historical record, not an estimate of future rent or investment return. For bedroom orientation, the local HUD ladder scales the ZIP ZORI into modelled monthly estimates—never measured bedroom rents—of $1,760 for a studio, $1,945 for one bedroom, $2,389 for two bedrooms, $3,199 for three bedrooms, and $3,682 for four bedrooms. The calculation preserves the local HUD relative bedroom steps around the ZIP’s all-rental-types index. It does not observe separate bedroom submarkets, identify individual building quality, or make a claim about any available unit.
That bedroom exercise should not be conflated with either ACS or HUD evidence. The matched Census ZCTA’s ACS 2024 5-year median gross rent is $1,566. This is a survey estimate for occupied renter homes, includes selected utilities, and carries reported survey uncertainty, rather than representing a contemporaneous asking-rent measure; the current ZORI is 52.6% higher. A ZCTA is a statistical area and is not identical to a USPS delivery ZIP, even though this five-digit label is both the Zillow ZIP market identifier and the Census ZCTA match. The FY2026 HUD two-bedroom FMR is $1,716 and is the ladder’s reference standard. HUD FMR/SAFMR is an administrative, bedroom-specific standard, using a ZIP SAFMR or county-derived ladder in this packet, not asking rent or a measured contract-rent series.
Affordability is most usefully framed as a mechanical screen, not as a conclusion about eligibility. Applying a 30% required-income screen to the current monthly ZORI yields $95,560 in annual income, compared with the matched ACS ZCTA median household income of $63,880. That screen is arithmetic, not advice and not an applicant-qualification rule; it does not test an individual household’s actual income, utility bill, or lease terms. In the ACS renter-household universe, 50.0% are recorded as paying gross rent at or above 30% of income. This population-level burden statistic does not prove what a particular unit costs, which utilities it includes, what a specific household earns, or what rent share an individual tenant will actually face.
Housing stock reinforces that the renter universe is central here, but it does not map directly to listings. The ACS ZCTA counts 11,818 housing units, with renter occupancy at 77.3%. Its overall vacancy rate is 10.2%, yet the vacant inventory includes 181 units identified as for rent and 719 seasonal units. The structure record separately identifies 3,708 units in large multifamily buildings alongside a smaller single-family component. These classifications describe housing and vacancy categories in the survey, not advertised inventory or turnover at a specified building. Neither the total vacancy rate nor the seasonal count establishes availability, condition, price movement, or landlord terms for a particular home; nor does the renter-heavy occupancy mix identify the type of a current listing.
Every series here has a different unit of observation and timing: ZORI is a ZIP-level index as of the stated month; ACS is a retrospective survey of occupied renter homes; HUD is an administrative standard; and city, county, and metro figures serve only as broad context. The modelled ladder therefore cannot replace a listing-level comparison. Concrete property-level checks are the advertised asking rent, confirmed bedroom count, which selected or other utilities are included, whether the unit is actually available, the lease term, concessions, and the date the price was observed. The useful final question is not whether one aggregate number wins, but whether the specific property’s documented terms fit the source universe being used for comparison.