An EMP would destroy EVERY local area.
Water purification plants would shut down - no water. Most cars would quit running - almost all trucks. Trains would stop and planes would fall out of the sky... The power grid would fail. If your house caught on fire, 911 wouldn't work - the firetruck wouldn't start, water would not flow to the hydrant... But IT would be local.
Every city and town would have the same situation - so there wouldn't be 'help' coming from out of the area... I think half the population would die in the first 20 days... lack of water would take out the first bunch...
An aircraft is more like a Faraday cage than most people realize. Think about a lightning strike and how it is disipated.
When I was a child much of what today is considered necessary, I didn't have growing up and neither did most americans....we lived in a city of over 1,000,000...... a pot belly stove can provide heat, just need to collect the wood...but I do believe city living people will be SOOL in many cases today..