Finding reliable apartment data is fundamental to making informed decisions in real estate. Whether you’re analyzing market trends, evaluating investment opportunities, or tracking rental rates, the quality of your data directly affects your strategy. This guide walks through ten sources that real estate professionals, investors, and proptech teams depend on for apartment market intelligence.
Each source offers different strengths—from comprehensive property databases to specialized rental analytics. The right choice depends on your specific needs, geography of interest, and whether you prioritize property-level details, market trends, or both.
Quick Overview
- CoStar — Multifamily property data sourced from primary research, public records, and Apartments.com listings with monthly rent updates and market analytics across hundreds of U.S. markets.
- Apartment List — Monthly rent estimates and rental data updated regularly, focusing on median rent paid for new leases in local markets.
- ALN Apartment Data — Multifamily research database covering occupancy rates, rents, and market analytics with property-level insights across 185 U.S. markets.
- Moody’s CRE (formerly REIS) — Commercial real estate data and analytics including apartment vacancy rates, rent levels, cap rates, and forecasts across 275+ U.S. markets.
- Zillow Research Data — Housing and rental data including rent indices, forecasts, and inventory metrics available for download and analysis.
- ATTOM Data Solutions — Comprehensive U.S. property data aggregator combining assessor records, deed history, rental models, and demographic data via API and bulk licensing.
- Zonda Research — Housing market reports and multifamily outlook data covering 100+ U.S. metro areas with apartment fundamentals and economic trend analysis.
- RealPage Analytics — Apartment data and research powered by RealPage Market Analytics, delivering trends, supply analysis, and market commentary.
- U.S. Census Bureau — Federal housing vacancy data, new construction permits, and housing inventory estimates available at multiple geographic levels.
- RentRange — Rental data infrastructure platform providing institutional-grade rent estimates, comparable sales, and market trend reports via API and bulk licensing.
Detailed Breakdown
1. CoStar
What it is
CoStar delivers multifamily property data sourced through primary research, direct market input, public records, and data feeds including the Apartments.com marketplace. The platform covers millions of rental properties and tracks data points on rents, occupancy, ownership, and construction pipeline across major U.S. markets.
Why it matters
- Provides unmatched scale with over 16 million monthly rent updates and coverage of 38 million units.
- Enables market benchmarking, peer property comparisons, and rent trend analysis for portfolio management and pricing strategy.
- Offers forecasting tools that account for multiple economic scenarios and demographic shifts.
- Covers nearly 400 markets and 2,500 submarkets with both current data and historical trends.
How to use it / Key details
Access property-level data including rents, occupancy, concessions, and new construction details. Use CoStar’s market analytics to compare performance across properties and markets, identify vacancies and competitive gaps, and adjust lease and acquisition strategies. The platform supports custom forecasting based on different economic conditions and includes tools for property valuation, appraisal support, and portfolio benchmarking.
2. Apartment List
What it is
Apartment List publishes monthly rent estimates reflecting the median rent paid for new leases in specific markets. The research team uses transparent, timely data collection to track rental market movements and publishes downloadable reports by geography.
Why it matters
- Offers free and accessible market rent data updated monthly for hundreds of U.S. metros and subregions.
- Focuses specifically on actual rent paid (not asking rent), making it practical for understanding what tenants truly cost.
- Provides historical data and trend analysis to identify market direction and absorption patterns.
- Data is downloadable for custom analysis and integration into your own research workflows.
How to use it / Key details
Download monthly rent estimates, year-over-year growth rates, and vacancy indices from the Apartment List Research portal. Data includes national, metro, and submarket levels. The platform also publishes original research reports that analyze market dynamics, construction trends, and occupancy shifts—valuable for understanding the drivers behind rent movements.
3. ALN Apartment Data
What it is
ALN Apartment Data is a multifamily research firm that maintains a database of apartment properties, occupancy rates, amenities, and market fundamentals. ALN OnLine, their flagship product, covers over 16 million units across 185 U.S. markets with monthly updates.
Why it matters
- Provides property-level details including unit counts, amenities, rent, and occupancy for precise market analysis.
- Enables custom market surveys and geo-based searches tailored to specific investment criteria.
- Supports decision-making for management companies, brokers, lenders, and appraisers with comprehensive trend analysis.
- Delivers data in exportable formats (Excel, PDF) for easy integration with other tools and workflows.
How to use it / Key details
Search properties by location, size, amenities, and rent to build comparable databases and market baskets. Use custom market surveys to track supply growth, occupancy changes, and rent trends in submarkets. The geo-search tools help identify competitive sets and underperforming assets. Trend reports highlight new construction pipeline and market shifts.
4. Moody’s CRE (formerly REIS)
What it is
Moody’s CRE provides commercial real estate data and analytics, including apartment-specific metrics such as vacancy rates, rent levels, cap rates, and valuations. The platform covers 275+ U.S. markets and more than 6,300 market segments with quarterly updated forecasts and trends.
Why it matters
- Combines apartment metrics with broader CRE context (office, retail, industrial) for holistic market understanding.
- Includes cap rate data and valuation estimates useful for acquisition and disposition strategies.
- Provides quarterly updated forecasts that help anticipate market shifts and adjust strategy accordingly.
- Integrates with Zillow’s multifamily rental data to enhance rent and vacancy coverage across markets.
How to use it / Key details
Access market and submarket apartment data through Moody’s analytics platform. Analyze rent, vacancy, and inventory trends with quarterly forecasts. Compare cap rates and valuations across geographies and over time. Use the data for underwriting acquisitions, assessing market risk, and benchmarking portfolio performance against market norms.
5. Zillow Research Data
What it is
Zillow provides housing market research data available for download, including the Zillow Observed Rent Index (ZORI) and rent forecasts (ZORF). Data covers multifamily and single-family rental segments at national, metro, and granular geographies, updated monthly.
Why it matters
- Offers free, downloadable datasets that are widely used across industry for research and benchmarking.
- Provides both current rent data and month-ahead and year-ahead forecasts for scenario planning.
- Available in multiple geographies from national down to ZIP code level.
- Integrated with Moody’s CRE platform to enhance market rent and vacancy insights for institutional users.
How to use it / Key details
Download ZORI data (rent index) and ZORF (rent forecast) as CSV files from Zillow’s research portal. Use the market explorer dashboard to explore rent trends, inventory, and new listings by region. Analyze monthly updates to track market momentum and identify seasonal patterns. The data is useful for both consumer-facing applications and institutional analysis.
6. ATTOM Data Solutions
What it is
ATTOM is a nationwide U.S. property data aggregator combining assessor and tax records, deed and mortgage history, foreclosure filings, automated valuation models, demographic data, and hazard risk indicators into standardized property-level datasets.
Why it matters
- Offers comprehensive coverage of both residential and commercial properties including multifamily.
- Combines property ownership, transaction history, and risk indicators for deeper due diligence.
- Delivers data via API (JSON/XML), bulk licensing for warehouse ingestion, and cloud storage integration.
- Supports market analysis, competitive intelligence, and property valuation workflows.
How to use it / Key details
Access property records, ownership information, sale and mortgage history, and rental AVM models through ATTOM’s delivery methods. Use bulk licensing for batch processing and warehouse ingestion. The ATTOM Nexus discovery layer helps identify properties and markets matching your criteria. Data is standardized for easy integration into analytics platforms and underwriting systems.
7. Zonda Research
What it is
Zonda provides housing market reports and multifamily research covering 100+ U.S. metro areas. The Zonda Apartment Outlook delivers insights on leasing performance, renter demand, construction pipeline, and economic drivers with both proprietary and standard data points.
Why it matters
- Combines quantitative data (occupancy, rents, supply) with expert narrative interpretation for context.
- Covers 109 data fields including 48 proprietary metrics not available elsewhere.
- Includes supply and demand analysis alongside economic trend interpretation.
- Offers metro-level reports with consistent, comparable data across markets.
How to use it / Key details
Access Zonda Apartment Outlook reports by metro for quarterly or annual reviews of market fundamentals. Review leasing trends, renter demand indicators, pipeline growth, and economic drivers. Use proprietary demand metrics to understand renter sentiment and market strength beyond just rents and vacancies. Reports include forecasts and expert commentary to guide decision-making.
8. RealPage Analytics
What it is
RealPage Analytics (formerly MPF Research and Axiometrics) delivers apartment data and multifamily industry research powered by RealPage Market Analytics. The platform provides trends, news, and expert commentary on supply, demand, and rental market conditions.
Why it matters
- Sourced from RealPage Market Analytics, which covers a large segment of professionally managed apartments.
- Includes supply trend analysis, demand influencer tracking, and student housing market data.
- Features expert commentary and research reports that contextualize data movement.
- Provides local and national market insights suitable for trend monitoring and strategic planning.
How to use it / Key details
Subscribe to RealPage Analytics research reports on supply trends, demand drivers, and local market updates. Access research by geography and property type. Use supply data to anticipate market saturation and absorption challenges. Monitor demand influencer content to understand demographic and economic shifts affecting rental markets.
9. U.S. Census Bureau
What it is
The Census Bureau publishes federal housing data including vacancy rates, new housing construction permits, and housing inventory estimates. The American Community Survey (ACS) provides housing data at multiple geographic levels from national to Census tract.
Why it matters
- Free, authoritative data source for understanding broader housing supply, demand, and demographic trends.
- Covers housing vacancy, construction activity, and renter-occupied inventory at local and regional levels.
- Essential for understanding macroeconomic drivers of apartment demand (population growth, household formation).
- Enables cross-verification of private data sources and identifies potential market discrepancies.
How to use it / Key details
Access vacancy data through the American FactFinder portal. Review building permits to gauge new supply pipeline activity by region. Use ACS data to analyze renter-occupied household counts and estimate household growth rates. Download data at Census tract level for detailed local market analysis. Compare Census construction data with private sources to validate market trends.
10. RentRange
What it is
RentRange is a rental data infrastructure platform providing institutional-grade rent estimates, comparable lease data, and market trend reports accessible via API and bulk licensing. The platform is designed for investors, lenders, and property managers needing reliable rental comparables and market analysis.
Why it matters
- Offers API and bulk licensing options suitable for institutional workflows and platform integration.
- Provides comparable lease data alongside rent estimates for underwriting accuracy.
- Designed specifically for institutional use with contractual service levels and refresh schedules.
- Supports market analysis and trend reporting with updated data across U.S. markets.
How to use it / Key details
Integrate RentRange data via API for real-time rent estimates and comparable data in your systems. Use bulk licensing for batch processing and data warehouse ingestion. Access market trend reports by geography to support investment analysis. The platform supports both point-in-time valuations and historical trend analysis for property underwriting and market intelligence.
FAQ
What is the difference between apartment data and rental data?
Apartment data typically refers to multifamily properties specifically (buildings with 5+ units), while rental data can include apartments, single-family homes, townhouses, and other rental property types. In practice, the terms overlap, but apartment data sources focus on building-level metrics like occupancy, rents, and amenities, whereas broader rental data sources may combine different property types in their analysis.
How often is apartment data updated?
Update frequency varies by source. Some provide monthly updates (Apartment List, Zillow, RealPage Analytics), others quarterly (Moody’s CRE, Zonda), and others continuously or real-time (CoStar, ATTOM). Select a data source based on your analysis timeline and the currency of market signals you need.
Can I use free apartment data sources for professional investment analysis?
Free sources like Apartment List, Zillow Research, and Census Bureau data are valuable for trend identification, market overview, and benchmarking. However, for underwriting acquisitions or making capital allocation decisions, most institutions supplement with institutional-grade data (CoStar, Moody’s, ATTOM) that includes contractual service levels and documented refresh cadence.
How do I choose between CoStar and Moody’s for apartment market data?
CoStar is known for property-level detail, rent tracking granularity, and the Apartments.com marketplace integration. Moody’s CRE offers broader CRE context, cap rates, and valuations. If you focus on rent and occupancy analysis, CoStar may be better suited; if you need valuation and cap rate benchmarking, Moody’s is a stronger choice. Many institutional investors use both.
Are apartment data sources reliable for forecasting rent growth?
Most major sources (CoStar, Moody’s, Zillow, Zonda) publish rent forecasts, but they rely on historical patterns and economic assumptions that may not predict unprecedented market shifts. Use forecasts as one input alongside your own economic analysis and local market expertise. Cross-check forecasts across sources to identify consensus and outliers.
