Our week-long countdown has already included a fascinating mix of household names and backroom big-hitters.

Below is the top 20 — including the popular but polarising figure our senior journalists selected as the person who is having the single biggest impact on our state.

Selected by a panel of leaders from the Advertiser newsroom, the top 100 have either had a significant impact in the past year or are likely to do so in 2018 — and have done something differently that is having a real impact on our community, beyond just holding a powerful or influential position.

... and one last wildcard ...

101 — Elon Musk: A man so powerful a grovelling Jay Weatherill even changed his Twitter profile pic just to prove he had met him. Musk, the brains behind electric car company Tesla and rocket launcher Space X, arrived to a rock star welcome when he landed in Adelaide last year. The billionaire jetted in on his private jet to talk about the world’s biggest battery being built at Jamestown which was being spruiked as something of an answer to the state’s ongoing power woes. It seems unlikely he will ever return.

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So there you have it — the full list.

You can catch up on the prior instalments here:

PART 1: South Australia’s 100 Most Influential People, 81-100

PART 2: South Australia’s 100 Most Influential People, 61-80

PART 3: South Australia’s 100 Most Influential People, 41-60

PART 4: South Australia’s 100 Most Influential People, 21-40

On Monday we will open a discussion with our readers on the top 100. You will be able to vote on your selections for the most influential South Australians and tell us people who missed out that you think should have been included.