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We present an updated mid-infrared (MIR) versus X-ray correlation for thelocal active galactic nuclei (AGN) population based on the high angularresolution 12 and 18um continuum fluxes from the AGN subarcsecond MIR atlas and2-10 keV and 14-195 keV data collected from the literature. We isolate a sampleof 152 objects with reliable AGN nature and multi-epoch X-ray data and minimalMIR contribution from star formation. Although the sample is not homogeneous orcomplete, we show that our results are unlikely to be affected by biases. TheMIR--X-ray correlation is nearly linear and within a factor of two independentof the AGN type and the wavebands used. The observed scatter is <0.4 dex. Apossible flattening of the correlation slope at the highest luminosities probed(~ 10^45 erg/s) is indicated but not significant. Unobscured objects have, onaverage, an MIR--X-ray ratio that is only <= 0.15 dex higher than that ofobscured objects. Objects with intermediate X-ray column densities (22 < logN_H < 23) actually show the highest MIR--X-ray ratio on average. Radio-loudobjects show a higher mean MIR--X-ray ratio at low luminosities, while theratio is lower than average at high luminosities. This may be explained bysynchrotron emission from the jet contributing to the MIR at low-luminositiesand additional X-ray emission at high luminosities. True Seyfert 2 candidatesand double AGN do not show any deviation from the general behaviour. Finally,we show that the MIR--X-ray correlation can be used to verify the AGN nature ofuncertain objects. Specifically, we give equations that allow to determine theintrinsic 2-10 keV luminosities and column densities for objects with complexX-ray properties to within 0.34 dex. These techniques are applied to theuncertain objects of the remaining AGN MIR atlas, demonstrating the usefulnessof the MIR--X-ray correlation as an empirical tool.

The subarcsecond mid-infrared view of local active galactic nuclei: II. The mid-infrared--X-ray correlation