ZIP 20906 entered June 2026 with a Zillow Observed Rent Index (ZORI) of $1,895, a typical observed asking-rent index blended across rental types at the ZIP level. The index was 2.78% below its level a year earlier. Its exact same-month annualized changes were -2.78% at 1 year, 0.38% at 3 years, and 3.10% at 5 years. The latest cooling therefore breaks from the longer positive five-year path and follows a nearly flat three-year result. Because ZORI is an index rather than a quoted lease, it summarizes the typical observed asking-rent level instead of identifying an available home. It is a backward-looking measurement rather than a forecast or investment recommendation.
Record quality adds context but not certainty. The series carries a 99.0% historical coverage ratio through the stated endpoint. Annualized monthly-return variability was 2.78%, and maximum drawdown was -4.19%. Coverage documents observation availability, not certainty that every month represents the same mix of dwellings. Those measures make the history relatively complete while limiting confidence in any one current rent snapshot: monthly variation can move the index around a current reading, and the drawdown records a past retreat from a prior peak. Transparent national discovery ranks among history-eligible ZIPs are 2,701 for momentum, 1,205 for stability, and 2,467 for balanced history; lower rank is higher. They are retrospective descriptors, not forecasts.
Source universes answer different questions, so their level gaps are not contradictions. The matched Census ZCTA's ACS 2024 five-year median gross rent was $1,963, with a published ±$79 margin of error. It is a five-year survey of occupied renter homes and includes selected utilities, unlike ZORI's asking-rent index. The ACS figure describes a different population and rent concept, so it cannot be used as a current listing quote. A ZCTA is a statistical area and is not identical to a USPS delivery ZIP, although this label is both the Zillow ZIP market identifier and the Census ZCTA match. The FY2026 local two-bedroom HUD FMR/SAFMR benchmark is $2,190. It is an administrative, bedroom-specific standard, not asking rent.
Applying the local HUD ladder to ZORI generates modelled ZIP bedroom estimates: $1,644 for a studio, $1,696 for one bedroom, the current index for two bedrooms, $2,388 for three, and $2,812 for four. The estimates scale ZIP ZORI using the local HUD ladder, preserving the index level and the ladder's bedroom spacing without reporting rents actually observed by bedroom count. The method is designed for proportional comparison, not for matching a unit's floor plan, services, or lease package. They are modelled estimates and never measured bedroom rents. This transparent ladder is a comparison device, while individual listings can differ in quoted rent, utility treatment, fees, lease terms, concessions, and availability.
Income framing is especially sensitive to source scope. The matched ACS ZCTA reports median household income of $97,521. Annualizing the current ZORI produces an asking-rent-to-income ratio of 23.3%. At a 30% required-income screen, the same arithmetic implies $75,800 in annual income. That screen is arithmetic, not advice or an applicant qualification rule. The household-income median covers the ZCTA's reporting universe, not a verified renter income for an advertised property. Separately, ACS identifies 4,939 of 8,733 renter households, or 56.6%, as spending at least the threshold share of income on rent. This household-level survey indicator does not prove affordability or burden for a particular unit or applicant.
The matched ACS ZCTA contains 27,291 housing units, of which 1,333 were vacant, for a 4.9% vacancy rate. Renter-occupied units number 8,733, or 33.6% of occupied units. The stock is not all one form: 14,784 units are single-family and 4,778 are in large multifamily structures. Of the vacant stock, 345 units are classified for rent. These aggregate stock and vacancy categories are not a count of live listings and cannot demonstrate that any particular home is available. They also do not describe unit condition, price, or the timing of possible market exposure.
For wider context only, the city context for Silver Spring has a $1,966 rent measure, the county context for Montgomery County has $2,346, and the metro context for Washington-Arlington-Alexandria, DC-VA-MD-WV has $2,448. These wider-scope measures do not override the ZIP's history, survey results, or administrative benchmark. Time alignment, source definitions, survey uncertainty, and the index's blended rental mix remain material limits. Those checks distinguish a property claim from the regional and statistical aggregates above. The property-level checks outside every aggregate are the advertised asking rent, bedroom designation, utilities included, recurring fees, lease length, concessions, and actual availability. Does the specific property's evidence align with the comparison being made?