Well, not quite everyone.
But of the current field of 20 drivers, there are 12 of them who have won a Formula 1 GP.
These people have won once : (no particular order)
-Kovaleinen
-Kubica
-Trulli
-Button
-Vettel
And these people have won multiple GP :
-Raikkonen
-Massa
-Hamilton
-Alonso
-Coulthard
-Barrichello
-Fisichella

Most of the remainder have recorded a 2nd place as their top finish.
Next year we will lose DC, but hopefully we will be able to add Heidfeld or Webber to the list above.

Is this the most evenly spread Formula One field we've ever seen? You'd certainly have to go back to before the various Schumacher/Senna/Prost dominances. There were some races back then where of all the entrants, only 3 or 4 had wins under their belt.

I think this is a really good sign for F1, and a reflection of the closing up of the field. There are now many more competetive cars/drivers.

Agreed, it is good the wins have been spread around the field a bit more.

The luck must blow Quick Nick's way at some stage. He's been too close to the front for too long not to have won a race.

Fifteen winners out of a field of 24 at Belgium in 1978:

Fittipaldi, Hunt, Lauda, Watson, Andretti, Peterson, Mass, Brambilla, Laffite, Depailler, Scheckter, Reutemann, Ickx, Jones and Regazzoni

Indy 2005 there were only 4 people racing who hadn't won a race.

Okay so we've quickly established that this isn't such a unique occurance in F1 history but it must be close to the record for either driver's maiden wins in one season and/or different drivers winning in one season?

Which race had the least GP winners on the grid?

Im guessing first race of 92 didnt have many winners. Mansell/Senna/Berger/Patrese/Alboreto/Boutsen?

Monaco 94? Schumacher, Berger, Alboreto and Hill.

Alesi, Panis, Herbert, Barrichello, Hakkinen and Frentzen would all eventually score wins, but at the time hadn't yet.

At the start of 1995, there were only three winners on the grid - Hill, Schumacher and Berger.

1951 had 4 maiden winners. I think that was never beaten, but i could be wrong.

Wrong guess. The sparsely-attended 1960 Italian GP had precisely none. It was Phil Hill's debut win - his Ferrari teammates Ginther and von Trips would also go on to win races.

I didn't know that - that's a lovely fact

I think 82 saw five - Tambay, de Angelis, Rosberg, Patrese and Alboreto.

this is not unusual at all. What is more special is having a grid with 4 champions like in 86.. Prost, Piquet, Keke, Jones plus the biggest start of all Senna..

South Africa 1968: five champions on the grid - Clark, Hill, Brabham, Hulme and Surtees. Plus future champions Rindt and Stewart. 13 titles between them.

1950 Silverstone

Farina had won the '48 Monaco Grand Prix and the '49 Swiss Grand Prix. I think several others had won Grands Prix as well.

Damn you're right.

Fagioli, de Graffenreid, Rosier, Etancelin and Chiron.

Thank you! My memory isn't working properly at the moment.

And races without a WC on the grid?

Adelaide 94 has to be the last to this day, but before that?

And who, pray tell, won that race?

(I'd go for the 1996 French Grand Prix as the last one, where Michael Schumacher's engine expired on the parade lap. )

Before '94, I think we have to go back to the 1960 Italian GP again to find a race without a world champion.

Every race in 1958 except Argentina and France and all of 1959. Plus Italy 1960 again.

Mansell?

and only 2 that had?

Yes, but we talked about F1 GP wins. If other formulas count, everybody won here and there something.

4 isn't that unusual
1999 had Hill, Villenueve, Schuie and Hakkinen
1985 last couple of races had Prost who had already won, Piquet, Lauda, Rosberg and Jones
1979 Andretti, Lauda, Fittipaldi, Hunt and not one of them finished in the top 10 in the championship!
1970 Hulme, Stewart, Brabham, Hill, Surtees and Rindt won the title of course plus Fittipaldi and Andretti as future champs. Beat 8 past/future champs if you can....Britain & Germany 1970
1969 Hulme Hill Brabham Surtees
1968 as vitesse says below
1965 had Brabham, Hill, Clark and Surtees
1964 had Brabham, Hill, Hill and Clark

theres probably more.

To all intents and purposes they were F1 Grands Prix. Not World Championship events, certainly, but trying to apply the modern model and organisation of Formula One to different periods can be highly misleading IMO.

The last non championship F1 race was in 1983, prior to that there were literally LOADS. You have to be very careful with your phrasing. The Formula One World Championship actually only started in 1981, prior to that it was the World Drivers Championship and in 1952/3 The World Championship was run to F2 regs! So Ascari actually neverwon a F1 World Championship though h was World Champion twice...

Formula One started in 1947, and the cars raced in the 1950 World Championship were built to that same formula. The 1948 Monaco and 1949 Swiss GPs were indeed F1 GPs.

Incidentally, Ascari won the '49 Swiss GP. Farina was on pole but did not finish.

Yup, my mistake. It was the '46 Nations GP that I was thinking of, which given that the question was "Which race had the least GP winners on the grid?", means that it doesn't matter that it's pre-F1

Not Pedro Diniz.

Varzi and Nuvolari had both won major Formula GPs pre-War. Trossi, Bira, Wimille, Villoresi and Mays had all won other events of varying importance ....

I meant using the '46 Nations Grand Prix as an example of Farina winning a race, not as an answer to the question. My bad, I should have explained more clearly.