I was kind of surprised to find out that one of my neighbors has a pretty big car collection including:
Ferrari F355 spider
Ferrari 360 Coupe
Alfa Romeo 4c Coupe
Alfa Romeo 4c Spider
Porsche 997.2 Turbo S with some mods
Lotus Exige

Otherwise:
Lamborghini Huracan 580-2
Lamborghini Gallardo
Ferrari 488 GTB
Ferrari 458
X2 Ferrari 360
X2 Porsche GT3
Bentley Continental GTC

Several:
Maseratis
M's
Challenger Hellcats

Topeka Kansas
Lambo Gallardo Superleggera (seen it a few times)
Bentley
Some Maserati's
Few M's
An F12 (apparently, I've never seen it)
Some GTR's
A skyline or two

I think that's about it, otherwise endless array of classics and some decent JDM's

I don't live in an upper middle class area (though we will soon) but we live by a lot of them.

In the actual neighborhood somebody my dad knows owns a Corvette ZR1. Non-exotics that are special include an Audi S4 B6 (rare) and at one time a W220 S65 AMG. My neighbors across the street moved earlier this year but before doing so they had just gotten a Corvette Grand Sport C6. Their son, my classmate, dailies a blue Ford F150 SVT Lightning (so used to them because of this lol). They definitely made good money, just stayed here for a white and now their relatives live in the house.

Around the neighborhood, I have to list lol. These are regularly or used to be regularly:
- orange T/A Viper
- purple Hellcat Charger
- yas marina blue M4
- white RS7
- burgundy Granturismo (actually was a daily for a classmate at my high school)
- white GTR (same case as the above)
- silver Jaguar XFR
- red Corvette C7 (owned by dad of student at my former school)

Random spots driving through or around neighborhood:
- 90's Viper
- Bentley Mulsanne
- blue RS5
- orange Murcielago

I've seen a Lexus LC500 driving in my neighbourhood twice and I have managed to get pics.

Update from last year
991.2 Carrera
Audi R8 V10 Plus
Flying Spur
BMW M2 (always near my house)
GT350
LC500
RS4
S600
Cayenne Turbo S
RS7
CLA45 AMG
GLA45 AMG
Z07
Shitload of Model S and the occasional Ghibli

Dealer near my home just recently obtained a white Mercedes-AMG GT S, Maserati Quattroporte, Abarth 500 (worth mentioning), Bentley Continental GT, 2015 Ford Mustang GT and 2 different generation of BMW X5 Ms. And they are all for sale.

And returning from previous posts were:
- BMW M5 F10
- Yellow Porsche 911 Turbo 996
- White Ferrari 458 Italia with black roof
- Honda Civic Type R FK2

Also they used to had a Ferrari 360 Modena which had been sold.

Guy two doors down just got a brand new EWB Mulsanne and I'm like holy sh*t

New addition:
- 2017 Nissan GT-R NISMO (R35)
- 3 BMW M5s (1 E60, 2 F10s)
- Light blue BMW M4 F82
- Mercedes-Benz G 63 AMG
- Mercedes-Benz CLS 63 AMG
- Porsche Cayenne S Hybrid

Added:

2 of my neighbors had a Mercedes-Benz CL600 (W140) and a Porsche (possibly Cayenne/Macan) respectively

My neighborhood has a few with Minnesota Vikings, Timberwolves, and Wild players.

In my neighborhood:
Aston Martin Vantage
2x Corvette Z06
Ferrari California T

I have seen in my neighborhood:
Bentley Continental Supersport
And maybe a Dodge Viper

Corvette C7 Stingray
Maserati Ghibli Q4
Challenger SRT
X6M
RSQ3

Charlotte, NC

Live in my neighborhood:
- Audi R8 5.2 Spider (blue)
- BMW M2 (blue)
- Alfa Romeo GTA [don't know exact model] (blue)
- Porsche 356 [don't know if replica or real] (black)
- Maserati Ghibli (silver)

Previously lived in my neighborhood:
- Ferrari F430 Spider (red)
- Ferrari F430 Coupe (black, some track mods)
- BMW 1M (orange)

The 1M, F430 coupe, Alfa, BMW M2, and Audi R8 all were shared by the same owner. Super nice guy, took for a ride in his Ferrari the day he got it.

Way too many spots in my neighborhood to list but the best ever was a real Cobra.

I have pics off all except the Porsche in anybody wants to see them.

Volkswagen Golf MKI drag car with R32 Engine conversion, Custom Morris Minor Pickup, Modified Honda Civic EP2, Airbagged 90's BMW 7 Series with Porsche wheels, Porsche 996 Targa and a Project Volkswagen Caddy Pickup MKI (Drag Golf owner) :)

One guy near me has both a Porsche Boxster S and a Macan