When to Use 'AT', 'ON', and 'IN'

AT
PRECISE TIME - at 1 o'clock p.m. 
POINTat the corner, at the subway station, at the bus stop
DESTINATIONat the top of the mountain
LOCATIONat the back of the department store
TIME OF THE DAYat noon, at night
DESIGNATED SPECIFICThe train is due at 12:15 p.m.
SPECIFIC ADDRESSESShe lives at 55 Boretz Road in Durham.


ON
DAYS - on Monday
DATESon the 1st of July
SURFACEon the wall, on the table
PUBLIC TRANSPORTATIONon the train
DIRECTIONSon the left, on the right
FLOORSon the 1st floor
STREETon Mapo Street
AVENUESon the 5th avenue
DESIGNATED DAYS AND DATESMy brother is coming on Monday. 
We're having a party on the Fourth of July.
DESIGNATED NAMES OF STREETS, AVENUES, ETCHer house is on Boretz Road.


IN
MONTHS - in June
YEARS -in 2008
CENTURIESin the 22nd century
LONG PERIODS - in 6 months
ENCLOSED SPACEin the box, in my pocket
PRIVATE TRANSPORTATIONin a car, in a taxi, in a lift (elevator)
COUNTRIESin America, in Korea
TIME OF THE DAYin the morning, in the afternoon, in the evening
NON-SPECIFIC TIMES DURING A DAY, A MONTH, A SEASON OR A YEARHe started the job in 1971
She likes to jog in the morning.
It's too cold 
in winter to run outside.
NAMES OF LAND AREAS (towns, counties, states, countries, and continents) 
She lives in Durham
Durham is in Windham County.
Windham County is in Connecticut.


MORE EXAMPLES:

IN
in bed
in the bedroom
in the car
in the library
in school
in London
in my pocket
in a building
in the garden
in my wallet
in May
in summer
in 1990
in the 1990's
in the Ice Age
in the past
in the future
in the morning


AT
at work
at home
at the library
at the office
at school
at the bus stop
at the door
at the top 
at the exit
at the bottom
at 3:00 pm
at noon 
at dinnertime
at bedtime
at sunrise
at sunset
at the moment
at weekend
ON
on the bed
on the ceiling
on the floor
on the horse
on the plane
on the train
on the door
on the carpet
on a page
on the menu
on a bicycle
on television
on the right
on the left
on Sunday
on March 6th
on Labor Day
on my birthday