The Pelycosaur Republic of Dimetrodon Empire is a mammoth, genial nation, remarkable for its soft-spoken computers, state-planned economy, and devotion to social welfare. The compassionate population of 8.523 billion Dimetrodons enjoy extensive civil rights and enjoy a level of social equality free from the usual accompanying government corruption.

The large, liberal government juggles the competing demands of Education, Administration, and Environment. It meets to discuss matters of state in the capital city of Synapsid City. The average income tax rate is 63.9%, and even higher for the wealthy.

The thriving Dimetrodon economy, worth 697 trillion pesos a year, is driven entirely by a combination of government and state-owned industry, with private enterprise illegal. The industrial sector is led by the Tourism industry, with significant contributions from Information Technology, Beef-Based Agriculture, and Book Publishing. Average income is 81,852 pesos, and evenly distributed, with the richest citizens earning only 2.6 times as much as the poorest.

The rich and poor vomit into separate bags, the seventh son of a seventh son is fated to be a millionaire, children need to wear helmets and safety harnesses before mounting a carousel horse, and saying 'Hi Guys' to a mixed gender group of people at work is a fireable offense. Crime, especially youth-related, is totally unknown, thanks to a capable police force and progressive social policies in education and welfare. Dimetrodon Empire's national animal is the Dimetrodon, which frolics freely in the nation's many lush forests.

Dimetrodon Empire is ranked 13,417^th in the world and 207^th in the Rejected Realms for Most Eco-Friendly Governments, scoring 4,419.02 on the Dolphin Recycling Awareness Index.