Arizona Regional Multiple Listing Service The Arizona Regional Multiple Listing Service (ARMLS) started in Tempe, AZ in 1982 as the first regional MLS in the country. Now, ARMLS is the largest MLS in Arizona and serves 40,000 subscribers all across the state. ARMLS is consistently expanding and currently covers many Arizona cities such as Phoenix, … Continue reading Add ARMLS MLS Search & IDX Listings to Your Site