Chicagoland SIA is an alliance of independent insurance agents in the Chicagoland area. We are dedicated to the creation, ret ... ention and growth of the local independent insurance agency. Chicagoland SIA is a Master Agency within SIAA (Strategic Insurance Agency Alliance). SIAA is a national insurance alliance with negotiating power of more than 4300 independent agencies and the buying power of a $5.4 billion network. read more