You're probably talking about Lower Merion, but Bryn Mawr is also part of Radnor and Haverford - they are all different school districts with different taxes. If you have a specific property you're curious about, it's all public information - you can check with the township or with a local Realtor.
111 N. Wayne Ave.
Wayne, PA 19087
*2008 millage rate remains at 3.01 mills for Radnor Township real estate taxes, more commonly expressed as $3.01 per thousand dollars of a property's assessed value
*2008 millage rate for Delaware County is 4.825 mills ($4.825 per per thousand dollars ofa property's assessed value)
*2007-2008 millage rate for the Radnor School District is17.7269 ($17.7269 per thousand dollars ofa property's assessed value). The School District's 2008-2009 millage rate will be available after July 1.
One mill of real estate tax is equal to one dollar for each $1,000 of a property's assessed value. Since 2000, all real property in Delaware County is assessed by the County's Board of Assessments at a rate of 100.0% of each property's assumed market value in 1998.