Here are my favorite shows in this genre for each letter of the alphabet:

0-9 – 24 (2001–2014)

A – The Avengers (1961-1969)

B – Barney Miller (1975-1982)

C – Columbo (1971-1978)

D – Dragnet (1951-1959, 1967-1970)

E –

F –

G –

H –

I –

J –

K –

L –

M –

N –

O –

P –

Q –

R –

S –

T –

U –

V –

W –

X –

Y –

Z –