4221 S Neptune, Mesa, AZ 85212

Compare this assessment

Start with the county value and property facts, then review appraisal comps, recent sales, and prior-year changes to decide whether the assessment is worth challenging. The comps on this page are free to review; email sign-in is only used to save a printable report.

For nearby context, browse ZIP 85212 and Eastmark Development Unit 5/6 South Prcls 6-16, 6 assessment pages.

Appeal deadline

The appeal deadline for the 2027 Notice of Valuation was April 21, 2026. 2028 Notices of Valuation usually arrive in February.

Deadline rule: Within 60 days after the Assessor mails your Notice of Valuation. Evidence is reviewed first by the Maricopa County Assessor's Office; a further appeal goes to the State Board of Equalization (SBOE). Dates checked September 27, 2026 against the official source.

Assessment snapshot

These public MCAO records highlight what may be worth checking before you file.

• Assessment changeThe full cash value increased 1.0% from $734,200 in 2026 to $741,500 in 2027.
• Full cash value per square footThe current public record shows about $142 per square foot before any comparable-property adjustments.
• Nearby comparison areaThis page starts the equity review with public records for the Eastmark Development Unit 5/6 South Prcls 6-16, 6- neighborhood and ZIP 85212.
• Neighborhood value signalAmong 405 residential records in the same neighborhood, the average full cash value is about $124 per square foot.
• Area year-over-year signalNearby residential records with prior-year values moved about +2.5% on average.

Public appraisal comparison for 2027. Prepared October 6, 2026. Appraisal source: Maricopa County Assessor's Office. Sales data checked in this snapshot: October 4, 2026. Showing the last prepared sales evidence while recent sales are refreshed. Matches consider available size, age, location and property characteristics. How comparisons work.