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In order to understand the physical properties of the series of organicconductors $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]$X$ with $X$ = Cl, Br, and I,not only electronic correlations but also the effect of disorder has to betaken into account. While for Cl- and Br-containing salts the influence of bothparameters were investigated and a universal phase diagram was proposed, theposition of $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]I is still not settled. Here wehave conducted transport, infrared, and dielectric measurements on singlecrystals of the title compound to clarify its electronic state at lowtemperatures. The correlation strength was determined as $U/W \approx 2.2$;thus this salt is placed deeper in an insulating state compare to the twosister compounds. We found that inherent disorder leads to a Coulomb localizedinsulating state similar to the moderately x-ray-irradiated$\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]Cl.

Charge localization in strongly correlated $\kappa$-(BEDT-TTF)$_2$Cu[N(CN)$_2$]I due to inherent disorder