India, Feb. 15 -- Amazon.com Inc. is severing ties with small delivery firms around the country -- putting at least 1,300 drivers out of work -- in an effort to eliminate partners that aren't meeting its standards.

Bear Down Logistics, an Illinois company that rapidly expanded over the past two years, is shuttering operations in five states and letting go of about 400 drivers. Delivery Force, an Amazon delivery partner in Washington state, is cutting 272 drivers in Seattle and other cities. Kansas-based RCX Logistics, an Amazon delivery partner with operations in Texas, Alabama and Florida, will eliminate the jobs of more than 600 employees after losing its Amazon contract. Around the country, logistics firms are notifying state official...